feat: activity log producers

Taskfile.yml

@@ -178,8 +178,7 @@ tasks:
   mutate:
     desc: Gremlins mutation testing of the use cases → tmp/gremlins.json
     cmds:
-      - mkdir -p tmp
+      - bash scripts/mutate.sh
-      - gremlins unleash --integration --tags nofrontend --coverpkg=./internal/infrastructure/useCases/...,./api/middleware/...,./api/pkg/claims/... --timeout-coefficient 10 --output tmp/gremlins.json ./internal/infrastructure/useCases ./api/middleware ./api/pkg/claims
 
   test:web:
     desc: Run the SPA test suite (Vitest) in run mode

api/dependecyInjection.go

@@ -3,12 +3,14 @@ package api
 import (
 	domainAPIKey "RenewCMS/internal/domain/apikey"
 	domainArticle "RenewCMS/internal/domain/article"
+	domainAudit "RenewCMS/internal/domain/audit"
 	domainImage "RenewCMS/internal/domain/image"
 	domainInvite "RenewCMS/internal/domain/invite"
 	domainMail "RenewCMS/internal/domain/mail"
 	domainPurge "RenewCMS/internal/domain/purge"
 	domainUpdate "RenewCMS/internal/domain/update"
 	domainUser "RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/auditing"
 	"RenewCMS/internal/infrastructure/config"
 	"RenewCMS/internal/infrastructure/hashing"
 	"RenewCMS/internal/infrastructure/mailer"
@@ -19,6 +21,7 @@ import (
 	"RenewCMS/internal/infrastructure/storage"
 	"RenewCMS/internal/infrastructure/update"
 	"RenewCMS/internal/infrastructure/useCases"
+	"context"
 	"crypto/ed25519"
 	"log"
 	"net/http"
@@ -36,6 +39,7 @@ type UseCases struct {
 	apiKeyAuthMiddleware           func(http.Handler) http.Handler
 	Token                          *jwtauth.JWTAuth
 	PurgeScheduler                 *scheduler.Runner
+	ActivityCleanupScheduler       *scheduler.Runner
 	CreateArticleUseCase           *useCases.CreateArticleUseCase
 	GetArticleUseCase              *useCases.GetArticleUseCase
 	ListArticlesUseCase            *useCases.ListArticlesUseCase
@@ -78,6 +82,26 @@ type UseCases struct {
 	ListAPIKeysUseCase             *useCases.ListAPIKeysUseCase
 	RevokeAPIKeyUseCase            *useCases.RevokeAPIKeyUseCase
 	AuthenticateAPIKeyUseCase      *useCases.AuthenticateAPIKeyUseCase
+	ListActivityUseCase            *useCases.ListActivityUseCase
+	GetActivitySummaryUseCase      *useCases.GetActivitySummaryUseCase
+	ExportActivityUseCase          *useCases.ExportActivityUseCase
+	GetActivityRetentionUseCase    *useCases.GetActivityRetentionUseCase
+	UpdateActivityRetentionUseCase *useCases.UpdateActivityRetentionUseCase
+}
+
+func (c *UseCases) RunSchedulers(ctx context.Context) {
+	var running sync.WaitGroup
+	for _, runner := range []*scheduler.Runner{c.PurgeScheduler, c.ActivityCleanupScheduler} {
+		if runner == nil {
+			continue
+		}
+		running.Add(1)
+		go func() {
+			defer running.Done()
+			runner.Run(ctx)
+		}()
+	}
+	running.Wait()
 }
 
 type Repositories struct {
@@ -87,6 +111,8 @@ type Repositories struct {
 	InviteRepo        domainInvite.Repository
 	APIKeyRepo        domainAPIKey.Repository
 	PurgeSettingsRepo domainPurge.Repository
+	AuditRepo         domainAudit.Repository
+	AuditSettingsRepo domainAudit.SettingsRepository
 	MailRepo          domainMail.Repository
 	ReleaseFeed       domainUpdate.ReleaseFeed
 	UpdateStore       domainUpdate.StatusStore
@@ -217,6 +243,8 @@ func getRepositories(connection *database.Connection, settings config.Settings)
 		InviteRepo:        persistence.NewInviteRepository(db),
 		APIKeyRepo:        persistence.NewAPIKeyRepository(db),
 		PurgeSettingsRepo: persistence.NewPurgeSettingsRepository(db),
+		AuditRepo:         persistence.NewAuditEventRepository(db),
+		AuditSettingsRepo: persistence.NewAuditSettingsRepository(db),
 		MailRepo:          mailer.NewMailRepository(settings.Smtp),
 		ReleaseFeed:       update.NewGiteaReleaseFeed(settings.UpdateFeedURL),
 		UpdateStore:       update.NewJSONStatusStore(filepath.Join(dataDir, updateStatusFileName)),
@@ -236,40 +264,43 @@ func getUseCases(repos *Repositories, imageStorage domainImage.Storage, settings
 	hasher := hashing.NewBcryptHasher()
 	renderer := markdown.NewConverter()
 	keyGenerator := hashing.NewSHA256KeyGenerator()
-	mergeMedia := useCases.NewMergeMediaUseCase(repos.ImageRepo, repos.ArticleRepo, imageStorage)
+	recorder := auditing.NewRecorder(repos.AuditRepo, time.Now, log.Default())
+	mergeMedia := useCases.NewMergeMediaUseCase(repos.ImageRepo, repos.ArticleRepo, imageStorage, recorder)
 
-	runPurge := useCases.NewRunPurgeUseCase(repos.ImageRepo, repos.ArticleRepo, mergeMedia, repos.PurgeSettingsRepo, time.Now, log.Default())
+	runPurge := useCases.NewRunPurgeUseCase(repos.ImageRepo, repos.ArticleRepo, mergeMedia, repos.PurgeSettingsRepo, time.Now, log.Default(), recorder)
-	purgeScheduler := useCases.NewPurgeSchedulerUseCase(repos.PurgeSettingsRepo, runPurge)
+	purgeScheduler := useCases.NewPurgeSchedulerUseCase(repos.PurgeSettingsRepo, runPurge, recorder)
+	activityCleanup := useCases.NewCleanupActivityUseCase(repos.AuditRepo, repos.AuditSettingsRepo, recorder)
 
 	return &UseCases{
 		PurgeScheduler:                 scheduler.NewSystemRunner(purgeScheduler, log.Default()),
+		ActivityCleanupScheduler:       scheduler.NewSystemCleanupRunner(activityCleanup, log.Default()),
 		Token:                          jwtauth.New("HS256", []byte(settings.JWTSecret), nil),
-		CreateArticleUseCase:        useCases.NewCreateArticleUseCase(repos.ArticleRepo, renderer),
+		CreateArticleUseCase:           useCases.NewCreateArticleUseCase(repos.ArticleRepo, renderer, recorder),
 		GetArticleUseCase:              useCases.NewGetArticleUseCase(repos.ArticleRepo, renderer),
 		ListArticlesUseCase:            useCases.NewListArticlesUseCase(repos.ArticleRepo, renderer),
-		UpdateArticleUseCase:        useCases.NewUpdateArticleUseCase(repos.ArticleRepo, renderer),
+		UpdateArticleUseCase:           useCases.NewUpdateArticleUseCase(repos.ArticleRepo, renderer, recorder),
-		DeleteArticleUseCase:        useCases.NewDeleteArticleUseCase(repos.ArticleRepo),
+		DeleteArticleUseCase:           useCases.NewDeleteArticleUseCase(repos.ArticleRepo, recorder),
 		GetUserUseCase:                 useCases.NewGetUserUseCase(repos.UserRepo),
-		CreateUserUseCase:           useCases.NewCreateUserUseCase(repos.UserRepo, hasher, repos.MailRepo, settings.PublicURL),
+		CreateUserUseCase:              useCases.NewCreateUserUseCase(repos.UserRepo, hasher, repos.MailRepo, settings.PublicURL, recorder),
-		AuthenticateUserUseCase:     useCases.NewAuthenticateUserUseCase(repos.UserRepo, hasher),
+		AuthenticateUserUseCase:        useCases.NewAuthenticateUserUseCase(repos.UserRepo, hasher, recorder),
-		VerifyUserUseCase:           useCases.NewVerifyUserUseCase(repos.UserRepo, hasher),
+		VerifyUserUseCase:              useCases.NewVerifyUserUseCase(repos.UserRepo, hasher, recorder),
 		CancelRegistrationUseCase:      useCases.NewCancelRegistrationUseCase(repos.UserRepo),
-		RequestPasswordResetUseCase: useCases.NewRequestPasswordResetUseCase(repos.UserRepo, hasher, repos.MailRepo, settings.PublicURL),
+		RequestPasswordResetUseCase:    useCases.NewRequestPasswordResetUseCase(repos.UserRepo, hasher, repos.MailRepo, settings.PublicURL, recorder),
-		ResetPasswordUseCase:        useCases.NewResetPasswordUseCase(repos.UserRepo, hasher, repos.APIKeyRepo, time.Now),
+		ResetPasswordUseCase:           useCases.NewResetPasswordUseCase(repos.UserRepo, hasher, repos.APIKeyRepo, time.Now, recorder),
-		UpdateUserProfileUseCase:    useCases.NewUpdateUserProfileUseCase(repos.UserRepo),
+		UpdateUserProfileUseCase:       useCases.NewUpdateUserProfileUseCase(repos.UserRepo, recorder),
 		ListUsersUseCase:               useCases.NewListUsersUseCase(repos.UserRepo),
-		CreateInviteUseCase:         useCases.NewCreateInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher, repos.MailRepo, settings.PublicURL),
+		CreateInviteUseCase:            useCases.NewCreateInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher, repos.MailRepo, settings.PublicURL, recorder),
-		CancelInviteUseCase:         useCases.NewCancelInviteUseCase(repos.InviteRepo),
+		CancelInviteUseCase:            useCases.NewCancelInviteUseCase(repos.InviteRepo, recorder),
-		RenewInviteUseCase:          useCases.NewRenewInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher, repos.MailRepo, settings.PublicURL),
+		RenewInviteUseCase:             useCases.NewRenewInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher, repos.MailRepo, settings.PublicURL, recorder),
 		ListUsersAndInvitesUseCase:     useCases.NewListUsersAndInvitesUseCase(repos.UserRepo, repos.InviteRepo),
 		GetInviteUseCase:               useCases.NewGetInviteUseCase(repos.InviteRepo, hasher),
-		AcceptInviteUseCase:         useCases.NewAcceptInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher),
+		AcceptInviteUseCase:            useCases.NewAcceptInviteUseCase(repos.UserRepo, repos.InviteRepo, hasher, recorder),
 		SendMailUseCase:                useCases.NewSendMailUseCase(repos.MailRepo),
-		CreateImageUseCase:          useCases.NewCreateImageUseCase(repos.ImageRepo, imageStorage),
+		CreateImageUseCase:             useCases.NewCreateImageUseCase(repos.ImageRepo, imageStorage, recorder),
 		OpenMediaUseCase:               useCases.NewOpenMediaUseCase(imageStorage),
 		ListMediaUseCase:               useCases.NewListMediaUseCase(repos.ImageRepo, repos.ArticleRepo, repos.UserRepo),
-		RenameMediaUseCase:          useCases.NewRenameMediaUseCase(repos.ImageRepo),
+		RenameMediaUseCase:             useCases.NewRenameMediaUseCase(repos.ImageRepo, recorder),
-		DeleteMediaUseCase:          useCases.NewDeleteMediaUseCase(repos.ImageRepo, imageStorage),
+		DeleteMediaUseCase:             useCases.NewDeleteMediaUseCase(repos.ImageRepo, imageStorage, recorder),
 		MergeMediaUseCase:              mergeMedia,
 		GetMediaUsageUseCase:           useCases.NewGetMediaUsageUseCase(repos.ImageRepo, repos.ArticleRepo),
 		GetPurgeSettingsUseCase:        useCases.NewGetPurgeSettingsUseCase(repos.PurgeSettingsRepo),
@@ -278,18 +309,23 @@ func getUseCases(repos *Repositories, imageStorage domainImage.Storage, settings
 		RunPurgeUseCase:                runPurge,
 		GetSettingsUseCase:             useCases.NewGetSettingsUseCase(settings.Version),
 		GetUpdateStatusUseCase:         useCases.NewGetUpdateStatusUseCase(repos.UpdateStore, repos.UpdateJobs, repos.UpdateHelper, repos.UpdateResults, repos.RestartRequests, settings.Version, settings.Container, time.Now),
-		CheckForUpdateUseCase:       useCases.NewCheckForUpdateUseCase(repos.ReleaseFeed, repos.UpdateStore, settings.Version, time.Now),
+		CheckForUpdateUseCase:          useCases.NewCheckForUpdateUseCase(repos.ReleaseFeed, repos.UpdateStore, settings.Version, time.Now, recorder),
-		StartUpdateDownloadUseCase:  startUpdateDownloadUseCase(repos, settings),
+		StartUpdateDownloadUseCase:     startUpdateDownloadUseCase(repos, settings, recorder),
-		RequestRestartUseCase:       useCases.NewRequestRestartUseCase(repos.UpdateStore, repos.UpdateJobs, repos.UpdateHelper, repos.UpdateResults, repos.RestartRequests, settings.Version, time.Now),
+		RequestRestartUseCase:          useCases.NewRequestRestartUseCase(repos.UpdateStore, repos.UpdateJobs, repos.UpdateHelper, repos.UpdateResults, repos.RestartRequests, settings.Version, time.Now, recorder),
 		RecordRunningInfoUseCase:       useCases.NewRecordRunningInfoUseCase(repos.RunningInfo, settings.Version, os.Getpid(), time.Now),
-		CreateAPIKeyUseCase:         useCases.NewCreateAPIKeyUseCase(repos.APIKeyRepo, keyGenerator, time.Now),
+		CreateAPIKeyUseCase:            useCases.NewCreateAPIKeyUseCase(repos.APIKeyRepo, keyGenerator, time.Now, recorder),
 		ListAPIKeysUseCase:             useCases.NewListAPIKeysUseCase(repos.APIKeyRepo, repos.UserRepo, time.Now),
-		RevokeAPIKeyUseCase:         useCases.NewRevokeAPIKeyUseCase(repos.APIKeyRepo, repos.UserRepo, time.Now),
+		RevokeAPIKeyUseCase:            useCases.NewRevokeAPIKeyUseCase(repos.APIKeyRepo, repos.UserRepo, time.Now, recorder),
 		AuthenticateAPIKeyUseCase:      useCases.NewAuthenticateAPIKeyUseCase(repos.APIKeyRepo, keyGenerator, repos.UserRepo, time.Now),
+		ListActivityUseCase:            useCases.NewListActivityUseCase(repos.AuditRepo, repos.UserRepo, repos.ArticleRepo, repos.ImageRepo, repos.APIKeyRepo, time.Now),
+		GetActivitySummaryUseCase:      useCases.NewGetActivitySummaryUseCase(repos.AuditRepo, time.Now),
+		ExportActivityUseCase:          useCases.NewExportActivityUseCase(repos.AuditRepo, time.Now),
+		GetActivityRetentionUseCase:    useCases.NewGetActivityRetentionUseCase(repos.AuditSettingsRepo),
+		UpdateActivityRetentionUseCase: useCases.NewUpdateActivityRetentionUseCase(repos.AuditSettingsRepo, recorder),
 	}
 }
 
-func startUpdateDownloadUseCase(repos *Repositories, settings config.Settings) *useCases.StartUpdateDownloadUseCase {
+func startUpdateDownloadUseCase(repos *Repositories, settings config.Settings, recorder domainAudit.Recorder) *useCases.StartUpdateDownloadUseCase {
 	return useCases.NewStartUpdateDownloadUseCase(useCases.StartUpdateDownloadDependencies{
 		Store:          repos.UpdateStore,
 		Jobs:           repos.UpdateJobs,
@@ -306,6 +342,7 @@ func startUpdateDownloadUseCase(repos *Repositories, settings config.Settings) *
 		Platform:       domainUpdate.Platform{OS: runtime.GOOS, Arch: runtime.GOARCH},
 		FeedURL:        settings.UpdateFeedURL,
 		Now:            time.Now,
+		Recorder:       recorder,
 	})
 }
 

api/handlers/activity/activityHandler.go

@@ -0,0 +1,243 @@
+package activity
+
+import (
+	"RenewCMS/api/pkg/apperr"
+	"RenewCMS/api/pkg/claims"
+	validator "RenewCMS/api/pkg/validator"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/useCases"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"strconv"
+	"time"
+)
+
+const (
+	csvContentType        = "text/csv; charset=utf-8"
+	csvContentDisposition = `attachment; filename="activity.csv"`
+)
+
+type Handler struct {
+	ListUseCase    *useCases.ListActivityUseCase
+	SummaryUseCase *useCases.GetActivitySummaryUseCase
+	ExportUseCase  *useCases.ExportActivityUseCase
+}
+
+type filterQuery struct {
+	Q        string `validate:"max=200"`
+	Actor    string `validate:"max=40"`
+	Category string `validate:"omitempty,oneof=articles media users api_keys auth system"`
+	Outcome  string `validate:"omitempty,oneof=all success failed"`
+	Security string `validate:"omitempty,oneof=true"`
+	Range    string `validate:"omitempty,oneof=today 7d 30d custom"`
+	From     string `validate:"max=10"`
+	To       string `validate:"max=10"`
+}
+
+type listQuery struct {
+	filterQuery
+	Page int `validate:"gte=1"`
+	Size int `validate:"oneof=25 50 100"`
+}
+
+type actorResponse struct {
+	Type audit.ActorType `json:"type"`
+	ID   *uint32         `json:"id"`
+	Name string          `json:"name"`
+}
+
+type targetResponse struct {
+	Type   string `json:"type"`
+	ID     string `json:"id"`
+	Name   string `json:"name"`
+	Exists bool   `json:"exists"`
+}
+
+type itemResponse struct {
+	ID            uint64          `json:"id"`
+	CreatedAt     time.Time       `json:"created_at"`
+	Action        string          `json:"action"`
+	Category      audit.Category  `json:"category"`
+	Actor         actorResponse   `json:"actor"`
+	Target        *targetResponse `json:"target"`
+	Outcome       audit.Outcome   `json:"outcome"`
+	FailureReason *string         `json:"failure_reason"`
+	Security      bool            `json:"security"`
+	Source        audit.Source    `json:"source"`
+	IP            *string         `json:"ip"`
+	UserAgent     *string         `json:"user_agent"`
+	Params        map[string]any  `json:"params"`
+	Changes       []audit.Change  `json:"changes"`
+}
+
+type listResponse struct {
+	Items []itemResponse `json:"items"`
+	Total int            `json:"total"`
+	Page  int            `json:"page"`
+	Size  int            `json:"size"`
+}
+
+func NewHandler(list *useCases.ListActivityUseCase, summary *useCases.GetActivitySummaryUseCase, export *useCases.ExportActivityUseCase) *Handler {
+	return &Handler{ListUseCase: list, SummaryUseCase: summary, ExportUseCase: export}
+}
+
+func readFilterQuery(values url.Values) filterQuery {
+	return filterQuery{
+		Q:        values.Get("q"),
+		Actor:    values.Get("actor"),
+		Category: values.Get("category"),
+		Outcome:  values.Get("outcome"),
+		Security: values.Get("security"),
+		Range:    values.Get("range"),
+		From:     values.Get("from"),
+		To:       values.Get("to"),
+	}
+}
+
+func readListQuery(values url.Values) (listQuery, error) {
+	page, err := intParam(values, "page", 1)
+	if err != nil {
+		return listQuery{}, err
+	}
+	size, err := intParam(values, "size", 25)
+	if err != nil {
+		return listQuery{}, err
+	}
+	return listQuery{filterQuery: readFilterQuery(values), Page: page, Size: size}, nil
+}
+
+func intParam(values url.Values, name string, fallback int) (int, error) {
+	if !values.Has(name) {
+		return fallback, nil
+	}
+	return strconv.Atoi(values.Get(name))
+}
+
+func toActivityQuery(query filterQuery) useCases.ActivityQuery {
+	return useCases.ActivityQuery{
+		Q:        query.Q,
+		Actor:    query.Actor,
+		Category: query.Category,
+		Outcome:  query.Outcome,
+		Security: query.Security,
+		Range:    query.Range,
+		From:     query.From,
+		To:       query.To,
+	}
+}
+
+func writeActivityError(w http.ResponseWriter, err error) {
+	switch {
+	case errors.Is(err, audit.ErrInvalidFilter):
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+	case errors.Is(err, audit.ErrActorNotAllowed):
+		http.Error(w, apperr.OwnerOrAdminRequiredErrorMessage, http.StatusForbidden)
+	case errors.Is(err, user.ErrUserNotFound):
+		http.Error(w, apperr.UnauthorizedErrorMessage, http.StatusUnauthorized)
+	default:
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+	}
+}
+
+func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
+	query, err := readListQuery(r.URL.Query())
+	if err != nil || validator.Validate.Struct(query) != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+	viewerId, ok := claims.UserId(r)
+	if !ok {
+		http.Error(w, apperr.UnauthorizedErrorMessage, http.StatusUnauthorized)
+		return
+	}
+
+	activityQuery := toActivityQuery(query.filterQuery)
+	activityQuery.Page, activityQuery.Size = query.Page, query.Size
+	page, err := h.ListUseCase.ListActivity(useCases.ListActivityCommand{ViewerID: viewerId, Query: activityQuery})
+	if err != nil {
+		writeActivityError(w, err)
+		return
+	}
+
+	items := make([]itemResponse, 0, len(page.Items))
+	for _, entry := range page.Items {
+		items = append(items, toItemResponse(entry))
+	}
+	writeJSON(w, listResponse{Items: items, Total: page.Total, Page: page.Page, Size: page.Size})
+}
+
+func toItemResponse(entry useCases.ActivityEntry) itemResponse {
+	event := entry.Event
+	item := itemResponse{
+		ID:            event.ID,
+		CreatedAt:     event.CreatedAt,
+		Action:        event.Action,
+		Category:      event.Category,
+		Actor:         actorResponse{Type: event.Actor.Type, ID: event.Actor.ID, Name: event.Actor.Name},
+		Outcome:       event.Outcome,
+		FailureReason: event.FailureReason,
+		Security:      event.Security,
+		Source:        event.Source,
+		IP:            event.IP,
+		UserAgent:     event.UserAgent,
+		Params:        event.Params,
+		Changes:       event.Changes,
+	}
+	if item.Params == nil {
+		item.Params = map[string]any{}
+	}
+	if item.Changes == nil {
+		item.Changes = []audit.Change{}
+	}
+	if event.Target.Type != "" {
+		item.Target = &targetResponse{Type: event.Target.Type, ID: event.Target.ID, Name: event.Target.Name, Exists: entry.TargetExists}
+	}
+	return item
+}
+
+func (h *Handler) Summary(w http.ResponseWriter, r *http.Request) {
+	query := readFilterQuery(r.URL.Query())
+	if validator.Validate.Struct(query) != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	summary, err := h.SummaryUseCase.GetActivitySummary(toActivityQuery(query))
+	if err != nil {
+		writeActivityError(w, err)
+		return
+	}
+	writeJSON(w, summary)
+}
+
+func (h *Handler) Export(w http.ResponseWriter, r *http.Request) {
+	query := readFilterQuery(r.URL.Query())
+	if validator.Validate.Struct(query) != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	prepared, err := h.ExportUseCase.Prepare(toActivityQuery(query))
+	if err != nil {
+		writeActivityError(w, err)
+		return
+	}
+
+	w.Header().Set("Content-Type", csvContentType)
+	w.Header().Set("Content-Disposition", csvContentDisposition)
+	w.Header().Set("Cache-Control", "no-store")
+	_ = prepared.WriteCSV(w)
+}
+
+func writeJSON(w http.ResponseWriter, payload any) {
+	body, err := json.Marshal(payload)
+	if err != nil {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Cache-Control", "no-store")
+	_, _ = w.Write(body)
+}

api/handlers/apikey/apiKeyHandler.go

@@ -71,7 +71,7 @@ func (h *Handler) Create(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	created, err := h.CreateUseCase.CreateAPIKey(useCases.CreateAPIKeyCommand{
+	created, err := h.CreateUseCase.CreateAPIKey(r.Context(), useCases.CreateAPIKeyCommand{
 		UserID:    userId,
 		Name:      request.Name,
 		ExpiresAt: request.ExpiresAt,
@@ -161,7 +161,7 @@ func (h *Handler) Revoke(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := h.RevokeUseCase.RevokeAPIKey(userId, uint32(id)); err != nil {
+	if err := h.RevokeUseCase.RevokeAPIKey(r.Context(), userId, uint32(id)); err != nil {
 		switch {
 		case errors.Is(err, domain.ErrAPIKeyNotFound):
 			http.Error(w, apperr.APIKeyNotFoundErrorMessage, http.StatusNotFound)

api/handlers/article/articleHandler.go

@@ -149,7 +149,7 @@ func (h *Handler) PostArticle(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	createdArticle, err := h.CreateUseCase.CreateArticle(useCases.CreateArticleCommand{
+	createdArticle, err := h.CreateUseCase.CreateArticle(r.Context(), useCases.CreateArticleCommand{
 		Title:  localArticle.Title,
 		Body:   localArticle.Body,
 		Format: format,
@@ -201,7 +201,7 @@ func (h *Handler) setIsOnline(w http.ResponseWriter, r *http.Request, isOnline b
 		return
 	}
 
-	updatedArticle, err := h.UpdateUseCase.UpdateIsOnline(id, isOnline, format)
+	updatedArticle, err := h.UpdateUseCase.UpdateIsOnline(r.Context(), id, isOnline, format)
 	if err != nil {
 		writeArticleErrorResponse(w, err)
 		return
@@ -237,7 +237,7 @@ func (h *Handler) UpdateArticleBody(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	updatedArticle, err := h.UpdateUseCase.UpdateBody(id, localArticle.Body, format)
+	updatedArticle, err := h.UpdateUseCase.UpdateBody(r.Context(), id, localArticle.Body, format)
 	if err != nil {
 		writeArticleErrorResponse(w, err)
 		return
@@ -314,7 +314,7 @@ func (h *Handler) DeleteArticle(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := h.DeleteUseCase.DeleteArticle(id); err != nil {
+	if err := h.DeleteUseCase.DeleteArticle(r.Context(), id); err != nil {
 		if errors.Is(err, domain.ErrArticleNotFound) {
 			http.Error(w, apperr.ArticleNotFoundErrorMessage, http.StatusNotFound)
 			return

api/handlers/auth/acceptInviteHandler.go

@@ -67,7 +67,7 @@ func (h *AcceptInviteHandler) AcceptInvite(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	createdUser, err := h.AcceptInviteUseCase.AcceptInvite(useCases.AcceptInviteCommand{
+	createdUser, err := h.AcceptInviteUseCase.AcceptInvite(r.Context(), useCases.AcceptInviteCommand{
 		Code:     request.Code,
 		Username: request.Username,
 		Password: request.Password,

api/handlers/auth/loginHandler.go

@@ -87,7 +87,7 @@ func (h *LoginHandler) Login(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	dbUser, err := h.AuthenticateUseCase.Authenticate(credentials.Username, credentials.Password)
+	dbUser, err := h.AuthenticateUseCase.Authenticate(r.Context(), credentials.Username, credentials.Password)
 	if err != nil {
 		http.Error(w, apperr.LogsErrorMessage, http.StatusForbidden)
 		return
@@ -113,7 +113,7 @@ func (h *LoginHandler) Register(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	createdUser, err := h.CreateUseCase.CreateUser(useCases.CreateUserCommand{
+	createdUser, err := h.CreateUseCase.CreateUser(r.Context(), useCases.CreateUserCommand{
 		Username: credentials.Username,
 		Password: credentials.Password,
 		Email:    credentials.Email,
@@ -139,7 +139,8 @@ func (h *LoginHandler) RegistrationStatus(w http.ResponseWriter, _ *http.Request
 	_, _ = w.Write(body)
 }
 
-func (h *LoginHandler) Logout(w http.ResponseWriter, _ *http.Request) {
+func (h *LoginHandler) Logout(w http.ResponseWriter, r *http.Request) {
+	h.AuthenticateUseCase.Logout(r.Context())
 	removeJwtCookie(w, h.IsProduction)
 	message, _ := json.Marshal(map[string]any{"message": "User logged out! HTTPonly jwt cookie deleted"})
 	_, _ = w.Write(message)

api/handlers/auth/passwordResetHandler.go

@@ -46,7 +46,7 @@ func (h *PasswordResetHandler) RequestPasswordReset(w http.ResponseWriter, r *ht
 		return
 	}
 
-	_ = h.RequestPasswordResetUseCase.RequestPasswordReset(credentials.Email)
+	_ = h.RequestPasswordResetUseCase.RequestPasswordReset(r.Context(), credentials.Email)
 
 	message, _ := json.Marshal(map[string]any{"message": apperr.PasswordResetRequestedMessage})
 	_, _ = w.Write(message)
@@ -66,7 +66,7 @@ func (h *PasswordResetHandler) ResetPassword(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	err = h.ResetPasswordUseCase.ResetPassword(credentials.Email, credentials.Code, credentials.Password)
+	err = h.ResetPasswordUseCase.ResetPassword(r.Context(), credentials.Email, credentials.Code, credentials.Password)
 	if err != nil {
 		if errors.Is(err, user.ErrInvalidPasswordResetCode) || errors.Is(err, user.ErrPasswordResetCodeExpired) {
 			http.Error(w, apperr.PasswordResetFailedErrorMessage, http.StatusForbidden)

api/handlers/auth/verificationHandler.go

@@ -50,7 +50,7 @@ func (h *VerificationHandler) Verify(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	verifiedUser, err := h.VerifyUseCase.Verify(userId, credentials.Code)
+	verifiedUser, err := h.VerifyUseCase.Verify(r.Context(), userId, credentials.Code)
 	if err != nil {
 		if errors.Is(err, user.ErrUserNotFound) {
 			http.Error(w, apperr.UnauthorizedErrorMessage, http.StatusUnauthorized)

api/handlers/media/mediaHandler.go

@@ -213,7 +213,7 @@ func (h *Handler) Upload(w http.ResponseWriter, r *http.Request) {
 	}
 	defer closeFile()
 
-	created, err := h.CreateUseCase.CreateImage(input)
+	created, err := h.CreateUseCase.CreateImage(r.Context(), input)
 	if err != nil {
 		upload.WriteCreateError(w, err)
 		return
@@ -247,7 +247,7 @@ func (h *Handler) Rename(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	renamed, err := h.RenameUseCase.Rename(id, request.Filename)
+	renamed, err := h.RenameUseCase.Rename(r.Context(), id, request.Filename)
 	if err != nil {
 		if errors.Is(err, domainImage.ErrInvalidFilename) {
 			http.Error(w, apperr.MediaFilenameErrorMessage, http.StatusBadRequest)
@@ -266,7 +266,7 @@ func (h *Handler) Delete(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := h.DeleteUseCase.Delete(id); err != nil {
+	if err := h.DeleteUseCase.Delete(r.Context(), id); err != nil {
 		writeImageError(w, err)
 		return
 	}
@@ -304,7 +304,7 @@ func (h *Handler) Merge(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	result, err := h.MergeUseCase.Merge(request.KeepID, request.MergeIDs)
+	result, err := h.MergeUseCase.Merge(r.Context(), request.KeepID, request.MergeIDs)
 	if err != nil {
 		writeMergeError(w, err)
 		return

api/handlers/media/purgeHandler.go

@@ -154,7 +154,7 @@ func (h *Handler) RunPurge(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	result, err := h.RunPurgeUseCase.Run(request.Fingerprint)
+	result, err := h.RunPurgeUseCase.Run(r.Context(), request.Fingerprint)
 	if err != nil {
 		writePurgeError(w, err)
 		return

api/handlers/settings/settingsHandler.go

@@ -1,21 +1,76 @@
 package settings
 
 import (
+	"RenewCMS/api/pkg/apperr"
+	validator "RenewCMS/api/pkg/validator"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/infrastructure/useCases"
 	"encoding/json"
+	"errors"
 	"net/http"
+	"time"
 )
 
 type Handler struct {
 	GetSettingsUseCase             *useCases.GetSettingsUseCase
+	GetActivityRetentionUseCase    *useCases.GetActivityRetentionUseCase
+	UpdateActivityRetentionUseCase *useCases.UpdateActivityRetentionUseCase
 }
 
-func NewHandler(getSettings *useCases.GetSettingsUseCase) *Handler {
+type UpdateSettingsRequest struct {
-	return &Handler{GetSettingsUseCase: getSettings}
+	ActivityRetentionDays *int `json:"activity_retention_days" validate:"required,oneof=0 30 90 365"`
+}
+
+type settingsResponse struct {
+	Version                    string     `json:"version"`
+	ActivityRetentionDays      int        `json:"activity_retention_days"`
+	ActivityLastCleanupAt      *time.Time `json:"activity_last_cleanup_at"`
+	ActivityLastCleanupRemoved int        `json:"activity_last_cleanup_removed"`
+}
+
+func NewHandler(getSettings *useCases.GetSettingsUseCase, getRetention *useCases.GetActivityRetentionUseCase, updateRetention *useCases.UpdateActivityRetentionUseCase) *Handler {
+	return &Handler{GetSettingsUseCase: getSettings, GetActivityRetentionUseCase: getRetention, UpdateActivityRetentionUseCase: updateRetention}
 }
 
 func (h *Handler) GetSettings(w http.ResponseWriter, _ *http.Request) {
-	body, err := json.Marshal(h.GetSettingsUseCase.GetSettings())
+	retention, err := h.GetActivityRetentionUseCase.GetActivityRetention()
+	if err != nil {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+	h.write(w, retention)
+}
+
+func (h *Handler) UpdateSettings(w http.ResponseWriter, r *http.Request) {
+	var request UpdateSettingsRequest
+	if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+	if err := validator.Validate.Struct(request); err != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	retention, err := h.UpdateActivityRetentionUseCase.UpdateActivityRetention(r.Context(), *request.ActivityRetentionDays)
+	if err != nil {
+		if errors.Is(err, audit.ErrInvalidRetention) {
+			http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+			return
+		}
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+	h.write(w, retention)
+}
+
+func (h *Handler) write(w http.ResponseWriter, retention audit.Settings) {
+	body, err := json.Marshal(settingsResponse{
+		Version:                    h.GetSettingsUseCase.GetSettings().Version,
+		ActivityRetentionDays:      retention.RetentionDays,
+		ActivityLastCleanupAt:      retention.LastCleanupAt,
+		ActivityLastCleanupRemoved: retention.LastCleanupRemoved,
+	})
 	if err != nil {
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return

api/handlers/update/updateHandler.go

@@ -47,7 +47,7 @@ func (h *Handler) GetStatus(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Handler) Check(w http.ResponseWriter, r *http.Request) {
-	if _, err := h.CheckForUpdateUseCase.Check(); err != nil {
+	if _, err := h.CheckForUpdateUseCase.Check(r.Context()); err != nil {
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}
@@ -58,8 +58,8 @@ func (h *Handler) Check(w http.ResponseWriter, r *http.Request) {
 	writeStatus(w, http.StatusOK, h.GetUpdateStatusUseCase.GetStatus(isOwner))
 }
 
-func (h *Handler) Download(w http.ResponseWriter, _ *http.Request) {
+func (h *Handler) Download(w http.ResponseWriter, r *http.Request) {
-	status, err := h.StartUpdateDownloadUseCase.Start()
+	status, err := h.StartUpdateDownloadUseCase.Start(r.Context())
 	if err != nil {
 		writeDownloadError(w, err)
 		return
@@ -77,7 +77,7 @@ func (h *Handler) Restart(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, apperr.UnauthorizedErrorMessage, http.StatusUnauthorized)
 		return
 	}
-	status, err := h.RequestRestartUseCase.Request(userId, kind)
+	status, err := h.RequestRestartUseCase.Request(r.Context(), userId, kind)
 	if err != nil {
 		writeRestartError(w, err)
 		return

api/handlers/user/inviteHandler.go

@@ -82,7 +82,7 @@ func (h *InviteHandler) CreateInvite(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	created, err := h.CreateInviteUseCase.CreateInvite(useCases.CreateInviteCommand{
+	created, err := h.CreateInviteUseCase.CreateInvite(r.Context(), useCases.CreateInviteCommand{
 		Email:     request.Email,
 		InvitedBy: userId,
 	})
@@ -124,7 +124,7 @@ func (h *InviteHandler) CancelInvite(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := h.CancelInviteUseCase.CancelInvite(id); err != nil {
+	if err := h.CancelInviteUseCase.CancelInvite(r.Context(), id); err != nil {
 		writeManageInviteError(w, err)
 		return
 	}
@@ -144,7 +144,7 @@ func (h *InviteHandler) RenewInvite(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	renewed, err := h.RenewInviteUseCase.RenewInvite(useCases.RenewInviteCommand{ID: id, RenewedBy: userId})
+	renewed, err := h.RenewInviteUseCase.RenewInvite(r.Context(), useCases.RenewInviteCommand{ID: id, RenewedBy: userId})
 	if err != nil {
 		writeManageInviteError(w, err)
 		return

api/handlers/user/userHandler.go

@@ -46,7 +46,7 @@ func (h *Handler) UpdateMe(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	updatedUser, err := h.UpdateProfileUseCase.UpdateDisplayName(userId, *request.DisplayName)
+	updatedUser, err := h.UpdateProfileUseCase.UpdateDisplayName(r.Context(), userId, *request.DisplayName)
 	if err != nil {
 		if errors.Is(err, user.ErrInvalidDisplayName) {
 			http.Error(w, apperr.DisplayNameErrorMessage, http.StatusBadRequest)

api/middleware/apiKey.go

@@ -19,6 +19,8 @@ const bearerScheme = "bearer "
 
 type apiKeyIdContextKey struct{}
 
+type apiKeyNameContextKey struct{}
+
 func bearerAPIKey(r *http.Request) (string, bool) {
 	header := r.Header.Get("Authorization")
 	if len(header) < len(bearerScheme) || !strings.EqualFold(header[:len(bearerScheme)], bearerScheme) {
@@ -34,6 +36,11 @@ func apiKeyIdFrom(r *http.Request) (uint32, bool) {
 	return id, ok
 }
 
+func apiKeyNameFrom(r *http.Request) string {
+	name, _ := r.Context().Value(apiKeyNameContextKey{}).(string)
+	return name
+}
+
 func RequireSession(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if _, isKey := bearerAPIKey(r); isKey {
@@ -70,6 +77,7 @@ func APIKeyAuth(authenticate *useCases.AuthenticateAPIKeyUseCase, maxRequests in
 
 			ctx := jwtauth.NewContext(r.Context(), token, nil)
 			ctx = context.WithValue(ctx, apiKeyIdContextKey{}, authenticated.Key.ID)
+			ctx = context.WithValue(ctx, apiKeyNameContextKey{}, authenticated.Key.Name)
 			limited.ServeHTTP(w, r.WithContext(ctx))
 		})
 	}

api/middleware/auditContext.go

@@ -0,0 +1,64 @@
+package middleware
+
+import (
+	"RenewCMS/api/pkg/claims"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/useCases"
+	"net/http"
+)
+
+func AuditContext(getUser *useCases.GetUserUseCase, trustedProxies []string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			origin := audit.Origin{
+				Actor:     auditActor(getUser, r),
+				Source:    auditSource(r),
+				IP:        clientIP(r, trustedProxies),
+				UserAgent: truncatedUserAgent(r),
+			}
+			next.ServeHTTP(w, r.WithContext(audit.WithOrigin(r.Context(), origin)))
+		})
+	}
+}
+
+func auditActor(getUser *useCases.GetUserUseCase, r *http.Request) audit.Actor {
+	if id, ok := apiKeyIdFrom(r); ok {
+		return audit.APIKeyActor(id, apiKeyNameFrom(r))
+	}
+	userId, ok := claims.UserId(r)
+	if !ok {
+		return audit.AnonymousActor("")
+	}
+	current, err := getUser.GetUser(userId)
+	if err != nil {
+		return audit.AnonymousActor("")
+	}
+	tokenVersion, ok := claims.TokenVersion(r)
+	if !ok || tokenVersion != current.TokenVersion {
+		return audit.AnonymousActor("")
+	}
+	return audit.UserActor(current)
+}
+
+func auditSource(r *http.Request) audit.Source {
+	if _, ok := apiKeyIdFrom(r); ok {
+		return audit.SourceAPIKey
+	}
+	return audit.SourceWeb
+}
+
+func clientIP(r *http.Request, trustedProxies []string) string {
+	realIP := r.Header.Get("X-Real-IP")
+	if realIP != "" && isTrustedProxy(r.RemoteAddr, trustedProxies) {
+		return realIP
+	}
+	return hostOf(r.RemoteAddr)
+}
+
+func truncatedUserAgent(r *http.Request) string {
+	runes := []rune(r.Header.Get("User-Agent"))
+	if len(runes) > audit.MaxUserAgentLength {
+		runes = runes[:audit.MaxUserAgentLength]
+	}
+	return string(runes)
+}

api/middleware/requireSignedIn.go

@@ -0,0 +1,20 @@
+package middleware
+
+import (
+	"RenewCMS/api/pkg/apperr"
+	"net/http"
+
+	"github.com/go-chi/jwtauth/v5"
+	"github.com/lestrrat-go/jwx/v2/jwt"
+)
+
+func RequireSignedIn(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		token, _, err := jwtauth.FromContext(r.Context())
+		if err != nil || token == nil || jwt.Validate(token) != nil {
+			http.Error(w, apperr.UnauthorizedErrorMessage, http.StatusUnauthorized)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}

api/router.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"RenewCMS/api/handlers/activity"
 	"RenewCMS/api/handlers/apikey"
 	"RenewCMS/api/handlers/article"
 	"RenewCMS/api/handlers/auth"
@@ -46,9 +47,10 @@ func (c *UseCases) apiKeyAuth() func(http.Handler) http.Handler {
 	return c.apiKeyAuthMiddleware
 }
 
-func NewArticleRouter(container *UseCases) http.Handler {
+func NewArticleRouter(container *UseCases, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
 	r.Use(container.apiKeyAuth())
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 
 	articleHandler := article.NewHandler(container.CreateArticleUseCase, container.GetArticleUseCase, container.ListArticlesUseCase, container.DeleteArticleUseCase, container.UpdateArticleUseCase, container.GetUserUseCase)
 
@@ -71,6 +73,8 @@ func NewArticleRouter(container *UseCases) http.Handler {
 
 func NewAuthRouter(container *UseCases, isProduction bool, rateLimit config.AuthRateLimitSettings, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
+	r.Use(jwtauth.Verifier(container.Token))
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 
 	loginHandler := auth.NewLoginHandler(container.Token, container.CreateUserUseCase, container.AuthenticateUserUseCase, isProduction)
 	verificationHandler := auth.NewVerificationHandler(container.VerifyUserUseCase, container.CancelRegistrationUseCase, isProduction)
@@ -124,6 +128,7 @@ func NewUserRouter(container *UseCases, rateLimit config.AuthRateLimitSettings,
 
 	r.Use(jwtauth.Verifier(container.Token))
 	r.Use(container.apiKeyAuth())
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 	r.Use(jwtauth.Authenticator(container.Token))
 	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
 	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
@@ -140,17 +145,51 @@ func NewUserRouter(container *UseCases, rateLimit config.AuthRateLimitSettings,
 	return r
 }
 
-func NewSettingsRouter(container *UseCases) http.Handler {
+func NewSettingsRouter(container *UseCases, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
 
-	settingsHandler := settings.NewHandler(container.GetSettingsUseCase)
+	settingsHandler := settings.NewHandler(container.GetSettingsUseCase, container.GetActivityRetentionUseCase, container.UpdateActivityRetentionUseCase)
 
+	r.Group(func(r chi.Router) {
 		r.Use(jwtauth.Verifier(container.Token))
 		r.Use(container.apiKeyAuth())
 		r.Use(jwtauth.Authenticator(container.Token))
 		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
 		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
 		r.Get("/", settingsHandler.GetSettings)
+	})
+	r.Group(func(r chi.Router) {
+		r.Use(middleware.RequireSession)
+		r.Use(jwtauth.Verifier(container.Token))
+		r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
+		r.Use(middleware.RequireSignedIn)
+		r.Use(jwtauth.Authenticator(container.Token))
+		r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
+		r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
+		r.Use(middleware.RequireOwner(container.GetUserUseCase))
+		r.Patch("/", settingsHandler.UpdateSettings)
+	})
+	return r
+}
+
+func NewActivityRouter(container *UseCases, trustedProxies []string) http.Handler {
+	r := chi.NewRouter()
+
+	activityHandler := activity.NewHandler(container.ListActivityUseCase, container.GetActivitySummaryUseCase, container.ExportActivityUseCase)
+
+	r.Use(middleware.RequireSession)
+	r.Use(jwtauth.Verifier(container.Token))
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
+	r.Use(middleware.RequireSignedIn)
+	r.Use(jwtauth.Authenticator(container.Token))
+	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
+	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
+	r.Get("/", activityHandler.List)
+	r.Group(func(r chi.Router) {
+		r.Use(middleware.RequireOwnerOrAdmin(container.GetUserUseCase))
+		r.Get("/summary", activityHandler.Summary)
+		r.Get("/export", activityHandler.Export)
+	})
 	return r
 }
 
@@ -161,13 +200,14 @@ const (
 	updateDownloadWindow      = time.Minute
 )
 
-func NewSystemRouter(container *UseCases) http.Handler {
+func NewSystemRouter(container *UseCases, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
 
 	updateHandler := update.NewHandler(container.GetUpdateStatusUseCase, container.CheckForUpdateUseCase, container.StartUpdateDownloadUseCase, container.RequestRestartUseCase, container.GetUserUseCase)
 
 	r.Use(middleware.RequireSession)
 	r.Use(jwtauth.Verifier(container.Token))
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 	r.Use(jwtauth.Authenticator(container.Token))
 	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
 	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
@@ -189,13 +229,14 @@ func NewSystemRouter(container *UseCases) http.Handler {
 	return r
 }
 
-func NewAPIKeyRouter(container *UseCases) http.Handler {
+func NewAPIKeyRouter(container *UseCases, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
 
 	apiKeyHandler := apikey.NewHandler(container.CreateAPIKeyUseCase, container.ListAPIKeysUseCase, container.RevokeAPIKeyUseCase)
 
 	r.Use(middleware.RequireSession)
 	r.Use(jwtauth.Verifier(container.Token))
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 	r.Use(jwtauth.Authenticator(container.Token))
 	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
 	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
@@ -205,13 +246,14 @@ func NewAPIKeyRouter(container *UseCases) http.Handler {
 	return r
 }
 
-func NewMediaRouter(container *UseCases) http.Handler {
+func NewMediaRouter(container *UseCases, trustedProxies []string) http.Handler {
 	r := chi.NewRouter()
 
 	mediaHandler := media.NewHandler(container.CreateImageUseCase, container.ListMediaUseCase, container.RenameMediaUseCase, container.DeleteMediaUseCase, container.MergeMediaUseCase, container.GetMediaUsageUseCase, container.GetPurgeSettingsUseCase, container.UpdatePurgeSettingsUseCase, container.PreviewPurgeUseCase, container.RunPurgeUseCase)
 
 	r.Use(jwtauth.Verifier(container.Token))
 	r.Use(container.apiKeyAuth())
+	r.Use(middleware.AuditContext(container.GetUserUseCase, trustedProxies))
 	r.Use(jwtauth.Authenticator(container.Token))
 	r.Use(middleware.RequireCurrentToken(container.GetUserUseCase))
 	r.Use(middleware.RequireVerifiedUser(container.GetUserUseCase))
@@ -241,13 +283,14 @@ func InitBackendRoutes(container *UseCases, settings config.Settings) *chi.Mux {
 	r.Get("/", GetHelloWorld)
 	r.Group(func(r chi.Router) {
 		r.Use(jwtauth.Verifier(container.Token))
-		r.Mount("/article", NewArticleRouter(container))
+		r.Mount("/article", NewArticleRouter(container, settings.TrustedProxies))
 	})
 	r.Mount("/user", NewUserRouter(container, settings.AuthRateLimit, settings.TrustedProxies))
-	r.Mount("/settings", NewSettingsRouter(container))
+	r.Mount("/settings", NewSettingsRouter(container, settings.TrustedProxies))
-	r.Mount("/media", NewMediaRouter(container))
+	r.Mount("/activity", NewActivityRouter(container, settings.TrustedProxies))
-	r.Mount("/api-key", NewAPIKeyRouter(container))
+	r.Mount("/media", NewMediaRouter(container, settings.TrustedProxies))
-	r.Mount("/system", NewSystemRouter(container))
+	r.Mount("/api-key", NewAPIKeyRouter(container, settings.TrustedProxies))
+	r.Mount("/system", NewSystemRouter(container, settings.TrustedProxies))
 	r.Mount("/auth", NewAuthRouter(container, settings.IsProduction(), settings.AuthRateLimit, settings.TrustedProxies))
 
 	return r

cmd/server/main.go

@@ -92,7 +92,7 @@ func run() error {
 	validator.InitValidator()
 
 	server := newServer(api.InitRoutes(container, settings), settings)
-	return serveUntilStopped(server, settings, container.RecordRunningInfoUseCase.Record, container.PurgeScheduler.Run)
+	return serveUntilStopped(server, settings, container.RecordRunningInfoUseCase.Record, container.RunSchedulers)
 }
 
 func initEnvVariables() {

docs/api.md

@@ -27,6 +27,62 @@ for example `https://cms.example/v1/article/`.
 | Users and invites | GET /v1/user/, PATCH /v1/user/me, POST /v1/user/invite (owner only), DELETE /v1/user/invite/{id} (owner only), POST /v1/user/invite/{id}/renew (owner only), GET /v1/auth/me |
 | Settings | GET /v1/settings |
 
+## Activity log
+The activity routes are session only: a key answers 403 "This action needs a real session." and a
+key never reads the audit trail. Events are append-only; there is no `POST`, `PUT`, `PATCH` or
+`DELETE` under `/v1/activity`.
+
+| Route | Who | Purpose |
+| --- | --- | --- |
+| `GET /v1/activity` | Any verified user | Filtered, paged events. Owner and admin see every event; any other role is scoped to its own events, and `actor` set to someone else answers 403 "Only owners and admins can do this." |
+| `GET /v1/activity/summary` | Owner, admin | Counts for the range, the previous period, active people and seven-bucket series. |
+| `GET /v1/activity/export` | Owner, admin | The same filters as the list without `page` or `size`, as a `text/csv; charset=utf-8` attachment (`when,actor,action,target,outcome,source,ip`). Cells starting with `=`, `+`, `-` or `@` get a leading quote. |
+
+Query: `q`, `actor` (`user:ID`, `key:ID`, `system`), `category` (`articles`, `media`, `users`,
+`api_keys`, `auth`, `system`), `outcome` (`all`, `success`, `failed`), `security` (`true`), `range`
+(`today`, `7d`, `30d`, `custom`; default `7d`), `from` and `to` (dates, with `custom`), `page` (from
+1) and `size` (25, 50 or 100). Any invalid value answers 400 with the body-mismatch message. Dates
+are UTC. The list answers `{ items, total, page, size }`, newest first (`created_at`, then `id`).
+
+`GET /v1/settings` also returns `activity_retention_days` (30, 90, 365 or 0 for forever, default
+90), `activity_last_cleanup_at` and `activity_last_cleanup_removed`. `PATCH /v1/settings` with
+`{"activity_retention_days": 30}` is session only and owner only (403 "Only the owner can do this.");
+any other value answers 400.
+
+### What is recorded
+Every real action is recorded by its use case, once, after the change was made (outcome `success`)
+or after the use case refused it (outcome `failed`, with a plain `failure_reason`). Nothing is
+recorded for a read (no `GET`, no list, no public article read, no status poll), for a request that
+fails validation, or for a target that does not exist (404). A failed audit write is logged and
+never changes the response or the change itself.
+
+| Category | Actions |
+| --- | --- |
+| `articles` | `article.create`, `article.edit`, `article.publish`, `article.unpublish`, `article.delete` |
+| `media` | `media.upload`, `media.rename`, `media.delete`, `media.merge`, `media.purge` |
+| `users` | `user.register`, `user.verify`, `user.update_profile`, `invite.create`, `invite.cancel`, `invite.renew`, `invite.accept` |
+| `system` | `system.media_purge` (scheduled), `system.update_checked`, `system.update_downloaded`, `system.restart_requested`, `system.activity_cleanup`, `system.activity_retention_changed` |
+
+Target types: `article`, `image`, `user`, `invite`, `api_key` and `release` (id and name are the tag).
+Only the fields `title`, `online`, `body`, `filename` and `display_name` appear in `changes`, with the
+kinds `text` and `body`; a body edit carries a signed character count delta and never the text. A
+change that leaves a value as it was (same body, same publish state, same file name, same display
+name) records nothing. Params: `media.merge` and `media.purge` and `system.media_purge` carry
+`merged` and `articles_updated`, plus `failed_groups` when a group failed (still outcome `success`);
+`system.update_checked` carries `update_available`; `system.restart_requested` carries `kind` and,
+for an update, `tag` (it has no target). `system.update_downloaded` is recorded when the job reaches
+`ready` or `failed`, with the origin captured at request time; a refusal at the start is recorded
+immediately. A failed registration or invite acceptance has an `anonymous` actor named by the
+attempted username.
+
+`failure_reason` is one fixed sentence per domain error, matched with `errors.Is`, at most 255
+characters, for example "The title must be between 3 and 200 characters.", "That file name is not
+valid.", "The merge request is not valid.", "A purge is already running.", "Registration is closed
+on this site.", "That invitation has expired.", "The release feed could not be reached." or "The
+update could not be downloaded.". Any other error becomes "Something went wrong on our side. Please
+try again."; the text of the error never reaches the event, the API or the CSV. Passwords, hashes,
+codes, article bodies, file bytes, storage paths and asset urls are never recorded.
+
 Article routes accept `?format=markdown|html|json` (default `markdown`). `GET /v1/media/` accepts
 `q`, `hash`, `cursor`, `filter`, `sort` and `limit`.
 

docs/architecture.md

@@ -55,6 +55,20 @@ The use cases `GetPurgeSettings`, `UpdatePurgeSettings`, `PreviewPurge` and `Run
 | `GET /v1/media/purge-preview` | Groups, copies, distinct articles, the first 5 groups, `more` and the fingerprint. |
 | `POST /v1/media/purge` | Runs the purge. Optional `fingerprint`; 409 when stale or when a run is in progress. |
 
+### Activity log
+
+`internal/domain/audit` holds the append-only `Event` (actor, target and failure-reason snapshots, outcome, security flag, source, ip, user agent, `params` and `changes`), the closed vocabularies (actor type, category, outcome, source, change kind), the `Filter`, `Summary` and `Settings` types, the `Repository` interface (`Append`, `List`, `Summary`, `DeleteOlderThan`: no way to edit or delete one event), the `SettingsRepository` (`Get`, `SaveRetention`, `SaveLastCleanup`; no row means 90 days) and the sentinels `ErrInvalidFilter`, `ErrInvalidRetention`, `ErrInvalidEvent` and `ErrActorNotAllowed`. The `Recorder` port is `Record(ctx, event)`; it returns nothing, so a caller can never fail on it.
+
+`internal/infrastructure/auditing.Recorder` is the adapter. It fills a missing actor, source, ip and user agent from the `audit.Origin` carried by the request context, stamps `created_at` from the injected clock in UTC, bounds long names, drops an event outside the vocabulary, and recovers from any error or panic of the repository by writing one line to the process log (the action and the error only). `middleware.AuditContext` builds the origin after the credential middleware: a session gives a `user` actor and source `web`, an API key an `api_key` actor and source `api_key`, no valid credential an `anonymous` actor; the ip is the peer address, or `X-Real-IP` when the peer is a trusted proxy; the user agent is cut to 255 characters. Use cases that produce events (authenticate and logout, password reset request and completion, API key create and revoke, retention change, cleanup) take the context and an `audit.Recorder`; secrets (passwords, raw keys, reset codes, tokens and their hashes) are never put in an event or in its log line.
+
+Persistence is `models.AuditEvent` (`audit_events`, indexes on `created_at`, `(actor_type, actor_id, created_at)` and `(category, created_at)`; `params` and `changes` are JSON text) and `models.AuditSettings` (one row), both in `AutoMigrate`. The queries use only portable SQL (`LOWER(...) LIKE ... ESCAPE '!'`, `COUNT(DISTINCT ...)`, `CASE` sums), so they run on SQLite, MySQL/MariaDB and PostgreSQL. The summary splits the range into seven equal buckets, oldest first.
+
+The use cases `ListActivity`, `GetActivitySummary` and `ExportActivity` turn the raw query into a domain filter (`range` defaults to 7 days; `custom` needs two dates, `to` included), scope a caller who is not owner or admin to its own events, and resolve `target.exists` at read time. The export reads the log through `List` in pages of 500 and writes the CSV with `encoding/csv`. `/v1/activity` and the settings `PATCH` sit behind `RequireSession`, the verifier, the current-token and verified-user checks; summary and export also behind `RequireOwnerOrAdmin`, the settings `PATCH` behind `RequireOwner`.
+
+`CleanupActivityUseCase.Tick(now)` follows the `PurgeScheduler` model. With a retention of 0 it never runs. Otherwise it is due once a day, at or after 03:00 in the location of `now` and when the last cleanup is before today's 03:00. It deletes events older than `now` minus the retention days (never newer than 24 hours), records the run (`activity_last_cleanup_at`, `activity_last_cleanup_removed`) even when nothing was removed, and only then records a `system.activity_cleanup` event when something was removed. A failing delete returns the error and leaves the last-cleanup fields as they were, so the next tick retries. `scheduler.Runner` now wraps a task with a label: `NewRunner` keeps the purge behaviour and log line, and `NewCleanupRunner` ticks the cleanup. `UseCases.RunSchedulers` runs both runners and `cmd/server/main.go` starts it with the server's signal context.
+
+Producers: `ArticleChanges`, `TextChange` and `BodyChange` in `internal/domain/audit` build the change lists (the body change holds only a signed rune count delta), and `NewTarget` and `ReleaseTarget` build the target snapshots (types `article`, `image`, `user`, `invite`, `api_key`, `release`). The use cases create, edit, publish, unpublish and delete article, upload, rename, delete, merge and purge media, register, verify, update profile, create, cancel, renew and accept invite, check, download and restart take the request context first and an `audit.Recorder` last, and record exactly one event after the change or the refusal (the action catalogue is in `docs/api.md`). Events are never written by handlers, middleware or GORM hooks, and nothing is recorded for reads or for a target that does not exist. `useCases/auditFailures.go` holds the fixed table of failure sentences keyed by domain `Err...` sentinels (matched with `errors.Is`, each at most 255 characters; the restart action overrides `ErrJobInProgress`) with the generic fallback "Something went wrong on our side. Please try again."; raw error text is never stored. The manual purge runs the groups through the non-recording `MergeMediaUseCase.merge`, so only one `media.purge` event is written; `RunPurgeUseCase.Execute` is the non-recording run that `PurgeSchedulerUseCase.Tick(now)` uses to record one `system.media_purge` event with the system actor and `context.Background()`. `StartUpdateDownloadUseCase` hands `context.WithoutCancel(ctx)` to its job goroutine so the `system.update_downloaded` event, written when the job becomes `ready` or `failed`, keeps the origin of the request. `middleware.AuditContext` is mounted on the article, user, media and system routers (after the API key middleware where keys are accepted), so API key calls are attributed to the key.
+
 ### Image metadata backfill
 
 At boot, `BackfillImageMetadataUseCase` (through `image.Repository.ListMissingMetadata` and `UpdateMetadata`) fills `filename`, `size`, `content_type`, `width`, `height` and `sha256` for image rows that lack them, reading the bytes through `image.Storage` (the files in `UPLOAD_DIR` with the local adapter, the bucket objects with the S3 adapter). It is idempotent, and a row whose file is missing or unreadable is left as it is without stopping the boot. The old `article_id` column and the `article_images` table are kept and never written.

docs/configuration.md

@@ -103,6 +103,10 @@ Relative paths are resolved against the process's working directory. In producti
 
 For example, `WorkingDirectory=/var/lib/renewcms` with `DB_FILE=./data/renewcms.db` puts the database in `/var/lib/renewcms/data`. Browser-update `--data-dir` must name that directory, because the app reads helper status and update records beside the database. It is not necessarily `WorkingDirectory` or `ReadWritePaths`. Do not change an existing `DB_FILE` merely to match the helper: that could open a different, empty database. See [browser-update setup](deployment.md#browser-updates).
 
+## Activity log retention
+
+The activity log needs no environment variable. Its retention period (30, 90, 365 days or forever, 90 by default) is a setting the owner changes with `PATCH /v1/settings`, and the daily cleanup runs at 03:00 in the server's time zone (`TZ`, or the host's zone).
+
 ## Adding a variable
 
 1. Read it in the code where it is needed (infrastructure or `api/`, never `internal/domain`).

features/activity-log-backend.feature

@@ -0,0 +1,560 @@
+Feature: The back-office keeps an append-only activity log that owners can read and retention can prune
+
+  As the owner of a RenewCMS site
+  I want every important action recorded with who, what, when and from where
+  So that I can review activity, spot failed logins and keep the log from growing forever
+
+  Background:
+    Given the spec of record is docs/design/screens/activity.md ("Roles", "API contract", "What is recorded") and docs/design/screens/settings.md ("Activity retention")
+    And this slice is backend only: no SPA, no new env var, no change to the design
+    And error responses are plain text from http.Error and success responses are JSON with snake_case fields
+    And the layering rule holds: internal/domain/audit imports only the stdlib and other domain packages, use cases see only domain interfaces, handlers see only use cases, persistence owns GORM, and no comment is added anywhere
+    And validation of query and body goes through validate tags and validator.Validate.Struct where a struct exists
+    And the error text for a malformed query or body is "The request cannot be processed due to a mismatch in the format of the body."
+
+  Rule: The domain event is a complete snapshot and the repository is append-only
+
+    Scenario: An event carries everything the log needs
+      Given an event is built for the action "article.publish" in category "articles"
+      Then it holds an actor snapshot (type, id, name), the action code and its params, the category, a target snapshot (type, id, name), an outcome, a failure_reason, a security flag, a source, an ip, a user_agent, changes and a created_at
+
+    Scenario Outline: The vocabulary is closed
+      Then the allowed <field> values are exactly <values>
+
+      Examples:
+        | field       | values                                          |
+        | actor.type  | user, api_key, system, anonymous                |
+        | category    | articles, media, users, api_keys, auth, system  |
+        | outcome     | success, failed                                 |
+        | source      | web, api_key, system                            |
+        | change.kind | text, body                                      |
+
+    Scenario: The repository exposes no way to edit or delete one event
+      Then the audit Repository interface has exactly the methods Append, List, Summary and DeleteOlderThan
+      And the persistence implementation exposes no other exported method than those and its constructor
+      And the HTTP surface has no POST, PUT, PATCH or DELETE under /v1/activity
+
+    Scenario: The sentinel errors are matchable
+      Then the audit package declares Err sentinels for an invalid filter and an invalid retention period
+      And each is asserted with errors.Is
+
+  Rule: The recorder never fails or blocks the caller
+
+    Scenario: A failing repository does not change the caller's result
+      Given the audit repository fails on Append with the error "disk full"
+      When a user logs in with valid credentials through POST /v1/auth/login
+      Then the response is 200 with a jwt cookie and the usual JSON message
+      And the process log contains a line naming the failed audit write and "disk full"
+
+    Scenario: A panicking repository does not crash the request
+      Given the audit repository panics on Append
+      When a user logs out through POST /v1/auth/logout
+      Then the response is 200 and the process continues serving
+
+    Scenario: The recorder fills the event from the audit context
+      Given a context holding actor user 3 "marta", source "web", ip "203.0.113.12" and user agent "Mozilla/5.0 test"
+      When the recorder records an event that has no actor, source, ip or user agent
+      Then the stored event has those values
+      And created_at is the injected clock's time in UTC
+
+    Scenario: Secrets never reach the log or the stored event
+      Given actions that handle a password, a raw API key, a reset code and a jwt
+      When they are recorded
+      Then no stored field, no params and no process log line contains any of those values or their hashes
+
+  Rule: The audit context is set by middleware from the credentials and the trusted-proxy IP
+
+    Scenario: A session sets a user actor with source web
+      Given a request with a valid jwt cookie for user 3 "marta"
+      When it passes the audit context middleware
+      Then the context holds actor type "user", id 3, name "marta" and source "web"
+
+    Scenario: An API key sets an api_key actor with source api_key
+      Given a request with "Authorization: Bearer <valid key>" for the key 7 named "Deploy bot"
+      When it passes the audit context middleware
+      Then the context holds actor type "api_key", id 7, name "Deploy bot" and source "api_key"
+
+    Scenario: No credentials sets an anonymous actor
+      Given a request without a cookie or key
+      Then the context holds actor type "anonymous" and source "web"
+
+    Scenario Outline: The ip comes from the trusted-proxy real IP only
+      Given the trusted proxies are "10.0.0.5"
+      And the request peer is "<peer>" and X-Real-IP is "<header>"
+      Then the context ip is "<ip>"
+
+      Examples:
+        | peer             | header       | ip           |
+        | 10.0.0.5:443     | 203.0.113.12 | 203.0.113.12 |
+        | 198.51.100.9:443 | 203.0.113.12 | 198.51.100.9 |
+        | 198.51.100.9:443 |              | 198.51.100.9 |
+
+    Scenario: The user agent is stored as sent and bounded
+      Given the User-Agent header is 400 characters long
+      Then the context user agent is its first 255 characters
+
+  Rule: Persistence stores events portably and indexed
+
+    Background:
+      Given the persistence tests run against a real in-memory SQLite database migrated with the model list of migrate.go
+      And the SQL stays portable across SQLite, MySQL/MariaDB and PostgreSQL
+
+    Scenario: The model is migrated with its indexes
+      Then the audit events table exists
+      And it has an index on created_at, an index on (actor_type, actor_id, created_at) and an index on (category, created_at)
+
+    Scenario: An appended event round-trips
+      When an event with params {"merged": 3}, changes and a null failure_reason is appended
+      Then listing returns it with every field equal, params and changes included
+
+    Scenario: List sorts by created_at descending then id descending
+      Given three events with the same created_at and one older
+      Then List returns the three by id descending, then the older one
+
+    Scenario Outline: Filters narrow the list and the total
+      Given events across actors, categories, outcomes and days
+      When List runs with <filter>
+      Then items and total contain exactly <expected>
+
+      Examples:
+        | filter                          | expected                                                              |
+        | actor user:3                    | events of user 3 only                                                 |
+        | actor key:7                     | events of api key 7 only                                              |
+        | actor system                    | events with actor type system only                                    |
+        | category auth                   | auth events only                                                      |
+        | outcome failed                  | failed events only                                                    |
+        | outcome success                 | succeeded events only                                                 |
+        | security true                   | events whose security flag is true                                    |
+        | q "SPRING"                      | events whose actor or target name contains "spring", case-insensitive |
+        | q "50%_"                        | only names containing the literal text 50%_                           |
+        | from 2026-10-01 to 2026-10-03   | events from 2026-10-01T00:00:00Z to the end of 2026-10-03             |
+
+    Scenario: Paging slices the sorted list and total is the unpaged count
+      Given 60 events
+      When List runs with page 2 and size 25
+      Then 25 items are returned, the 26th to 50th of the sorted list, and total is 60
+
+    Scenario: A page past the end is empty
+      When List runs with page 9 and size 25 over 60 events
+      Then items is empty and total is 60
+
+    Scenario: The summary counts the range and the previous period
+      Given events in the last 7 days and in the 7 days before
+      When Summary runs for range 7d
+      Then total, previous_total, failed and security are the counts of those periods
+      And active_people.users counts distinct user actors and active_people.api_keys counts distinct key actors, with anonymous and system excluded
+      And series holds seven daily counts for total, active, failed and security, oldest first
+
+    Scenario: DeleteOlderThan removes only events before the cutoff
+      Given events at 100, 40, 31, 29 and 1 days ago
+      When DeleteOlderThan runs with the cutoff 30 days ago
+      Then it returns 3 and only the 29-day and 1-day events remain
+
+  Rule: Reading the log is session only and scoped by role
+
+    Background:
+      Given the handler is mounted at /v1/activity behind jwtauth.Verifier, jwtauth.Authenticator, the current-token check and the verified-user check
+      And the routes sit behind RequireSession, so no API key reaches them
+
+    Scenario Outline: The credentials gate answers before any data
+      When GET <path> is sent <credentials>
+      Then the response is <status> with body "<body>"
+      And the audit repository was not read
+
+      Examples:
+        | path                    | credentials                       | status | body                                                     |
+        | /v1/activity            | without a jwt cookie              | 401    | You must be logged in to access this resource.           |
+        | /v1/activity/summary    | without a jwt cookie              | 401    | You must be logged in to access this resource.           |
+        | /v1/activity/export     | without a jwt cookie              | 401    | You must be logged in to access this resource.           |
+        | /v1/activity            | with a valid API key              | 403    | This action needs a real session.                        |
+        | /v1/activity/summary    | with a valid API key              | 403    | This action needs a real session.                        |
+        | /v1/activity/export     | with a valid API key              | 403    | This action needs a real session.                        |
+        | /v1/activity            | with an unverified user's cookie  | 403    | You must verify your account to access this resource.    |
+
+    Scenario Outline: Owner and admin see every event
+      Given events by users 1, 2 and 3, an api key and the system
+      When GET /v1/activity is sent with the cookie of the <role>
+      Then the response is 200 and total counts the events of every actor
+
+      Examples:
+        | role  |
+        | owner |
+        | admin |
+
+    Scenario: Another role is scoped to its own events
+      Given a verified user 3 whose role is neither owner nor admin
+      And events by users 1, 2 and 3
+      When GET /v1/activity is sent with user 3's cookie
+      Then every item has actor type "user" and id 3
+      And total counts only user 3's events
+
+    Scenario Outline: A scoped caller cannot ask for another actor
+      Given a verified user 3 whose role is neither owner nor admin
+      When GET /v1/activity?actor=<actor> is sent with user 3's cookie
+      Then the response is <status>
+
+      Examples:
+        | actor    | status |
+        | user:3   | 200    |
+        | user:2   | 403    |
+        | key:7    | 403    |
+        | system   | 403    |
+
+    Scenario Outline: A scoped caller cannot read the summary or the export
+      Given a verified user 3 whose role is neither owner nor admin
+      When GET <path> is sent with user 3's cookie
+      Then the response is 403 with body "Only owners and admins can do this."
+
+      Examples:
+        | path                 |
+        | /v1/activity/summary |
+        | /v1/activity/export  |
+
+  Rule: GET /v1/activity lists filtered, paged events
+
+    Scenario: The default request
+      Given 30 events over the last 3 days
+      When the owner sends GET /v1/activity
+      Then the response is 200 with {"items": [...], "total": 30, "page": 1, "size": 25}
+      And items has 25 entries, newest first
+
+    Scenario: An item has the documented shape
+      Given user 3 "Marta Alves" published the article 8 "Spring release" at 2026-10-06T10:42:18Z from 203.0.113.12 with "Chrome 129 on Windows"
+      When the owner sends GET /v1/activity
+      Then the first item is
+        """
+        {"id": 4821, "created_at": "2026-10-06T10:42:18Z", "action": "article.publish", "category": "articles", "actor": {"type": "user", "id": 3, "name": "Marta Alves"}, "target": {"type": "article", "id": "8", "name": "Spring release", "exists": true}, "outcome": "success", "failure_reason": null, "security": false, "source": "web", "ip": "203.0.113.12", "user_agent": "Chrome 129 on Windows", "params": {}, "changes": [{"field": "online", "kind": "text", "before": "false", "after": "true"}]}
+        """
+
+    Scenario: A system event has no ip or user agent
+      Given a system event "system.activity_cleanup"
+      When the owner sends GET /v1/activity
+      Then its item has actor {"type": "system", "id": null, "name": "System"}, source "system", ip null and user_agent null
+
+    Scenario: A renamed or deleted user still reads correctly
+      Given an event recorded when user 3 was named "Marta Alves"
+      And user 3 has since been renamed "M. Alves" and then deleted
+      When the owner sends GET /v1/activity
+      Then the item's actor.name is still "Marta Alves"
+
+    Scenario Outline: target.exists is resolved when the list is read
+      Given an event whose target is <type> "<id>" named "<name>"
+      And <state>
+      When the owner sends GET /v1/activity
+      Then the item's target.name is "<name>" and target.exists is <exists>
+
+      Examples:
+        | type    | id | name           | state                       | exists |
+        | article | 8  | Spring release | the article still exists    | true   |
+        | article | 8  | Spring release | the article was deleted     | false  |
+        | user    | 3  | Marta Alves    | the user was deleted        | false  |
+
+    Scenario: A body change carries a delta and never text
+      Given an event with a body change of +312 characters
+      Then its change is {"field": "body", "kind": "body", "delta": 312} with no before and no after
+
+    Scenario Outline: The filters are applied through the query
+      When the owner sends GET /v1/activity?<query>
+      Then the response is 200 and items match <expected>
+
+      Examples:
+        | query                                      | expected                                  |
+        | q=spring                                   | the actor or target name contains spring  |
+        | actor=user:3                               | events of user 3                          |
+        | actor=key:7                                | events of api key 7                       |
+        | actor=system                               | system events                             |
+        | category=auth                              | auth events                               |
+        | outcome=failed                             | failed events                             |
+        | outcome=success                            | succeeded events                          |
+        | outcome=all                                | both outcomes                             |
+        | security=true                              | events with the security flag             |
+        | range=today                                | events since 00:00 UTC today              |
+        | range=7d                                   | events of the last 7 days                 |
+        | range=30d                                  | events of the last 30 days                |
+        | range=custom&from=2026-09-01&to=2026-09-30 | events from 1 to 30 September 2026 UTC    |
+        | page=2&size=50                             | the second page of 50                     |
+
+    Scenario: Omitting range means 7 days
+      Given events 2 days old and 10 days old
+      When the owner sends GET /v1/activity
+      Then only the 2-day-old event is listed
+
+    Scenario Outline: Invalid values answer 400
+      When the owner sends GET /v1/activity?<query>
+      Then the response is 400 with body "The request cannot be processed due to a mismatch in the format of the body."
+      And the audit repository was not read
+
+      Examples:
+        | query                                      |
+        | actor=user:abc                             |
+        | actor=user:-1                              |
+        | actor=group:3                              |
+        | category=billing                           |
+        | outcome=maybe                              |
+        | security=false                             |
+        | range=year                                 |
+        | range=custom                               |
+        | range=custom&from=2026-09-30&to=2026-09-01 |
+        | range=custom&from=yesterday&to=today       |
+        | page=0                                     |
+        | page=abc                                   |
+        | size=10                                    |
+        | size=200                                   |
+
+  Rule: GET /v1/activity/summary answers the strip
+
+    Scenario: The summary of the last seven days
+      Given 12 events in the last 7 days, 3 failed, 2 with the security flag, by 2 users and 1 api key
+      And 10 events in the 7 days before
+      When the owner sends GET /v1/activity/summary?range=7d
+      Then the response is 200 and the body is
+        """
+        {"total": 12, "previous_total": 10, "active_people": {"users": 2, "api_keys": 1}, "failed": 3, "security": 2, "series": {"total": [...7 numbers], "active": [...7], "failed": [...7], "security": [...7]}}
+        """
+      And each series array has 7 entries, oldest first, and the total series sums to 12
+
+    Scenario: An empty log answers zeros
+      Given no events
+      When the owner sends GET /v1/activity/summary
+      Then every number is 0 and every series array is seven zeros
+
+    Scenario: The summary uses the same filters as the range
+      When the owner sends GET /v1/activity/summary?range=custom&from=2026-09-01&to=2026-09-07
+      Then the counts cover exactly that range and previous_total covers the 7 days immediately before 2026-09-01
+
+    Scenario: An invalid range answers 400
+      When the owner sends GET /v1/activity/summary?range=year
+      Then the response is 400 with the body-mismatch message
+
+  Rule: GET /v1/activity/export streams a safe CSV
+
+    Scenario: The response is a CSV attachment
+      Given 3 events
+      When the owner sends GET /v1/activity/export
+      Then the response is 200 with Content-Type "text/csv; charset=utf-8" and Content-Disposition starting with "attachment"
+      And the first row is "when,actor,action,target,outcome,source,ip"
+      And there are 3 data rows, newest first
+
+    Scenario: A row holds the documented columns only
+      Given user 3 "Marta Alves" published "Spring release" at 2026-10-06T10:42:18Z from 203.0.113.12 with changes and a user agent
+      Then the row is "2026-10-06T10:42:18Z,Marta Alves,article.publish,Spring release,success,web,203.0.113.12"
+      And the file contains no changes and no user agent
+
+    Scenario Outline: Cells that a spreadsheet would evaluate are neutralised
+      Given an event whose <column> is "<value>"
+      Then the cell is "<cell>"
+
+      Examples:
+        | column | value            | cell              |
+        | actor  | =cmd             | '=cmd             |
+        | target | +1+1             | '+1+1             |
+        | target | -2               | '-2               |
+        | actor  | @SUM(A1)         | '@SUM(A1)         |
+        | target | Spring release   | Spring release    |
+        | target | a=b              | a=b               |
+
+    Scenario: Commas, quotes and newlines are quoted
+      Given a target whose name contains a comma, double quotes and a newline
+      Then the cell is quoted with doubled inner quotes and the file still has one row for the event
+
+    Scenario: The export uses the list filters without paging
+      Given 60 events of which 8 failed
+      When the owner sends GET /v1/activity/export?outcome=failed&page=2&size=25
+      Then the file has the 8 failed rows and page and size are ignored
+
+    Scenario: A system event has an empty ip cell
+      Given a system event
+      Then its ip cell is empty
+
+    Scenario: An invalid filter answers 400 before any byte is streamed
+      When the owner sends GET /v1/activity/export?outcome=maybe
+      Then the response is 400 with the body-mismatch message and no CSV header
+
+    Scenario: A large export is read in batches
+      Given 1200 events
+      When the owner exports them
+      Then the file has 1200 rows and the repository was read through List in pages, not all at once
+
+  Rule: The retention period is a setting only the owner can change
+
+    Scenario: The default is 90 days
+      Given no retention row exists
+      When a verified user sends GET /v1/settings
+      Then the body has "activity_retention_days": 90, "activity_last_cleanup_at": null and "activity_last_cleanup_removed": 0
+      And the existing fields of the response are unchanged
+
+    Scenario: The last cleanup is reported
+      Given a cleanup ran at 2026-10-06T03:00:00Z and removed 142 events
+      When a verified user sends GET /v1/settings
+      Then "activity_last_cleanup_at" is "2026-10-06T03:00:00Z" and "activity_last_cleanup_removed" is 142
+
+    Scenario Outline: The owner sets a valid period
+      When the owner sends PATCH /v1/settings with body {"activity_retention_days": <days>}
+      Then the response is 200 and the body has "activity_retention_days": <days>
+      And a following GET /v1/settings returns <days>
+
+      Examples:
+        | days |
+        | 30   |
+        | 90   |
+        | 365  |
+        | 0    |
+
+    Scenario Outline: Any other value answers 400 and changes nothing
+      Given the stored retention is 90
+      When the owner sends PATCH /v1/settings with body <body>
+      Then the response is 400 with body "The request cannot be processed due to a mismatch in the format of the body."
+      And the stored retention is still 90
+
+      Examples:
+        | body                                |
+        | {"activity_retention_days": 7}      |
+        | {"activity_retention_days": -1}     |
+        | {"activity_retention_days": 366}    |
+        | {"activity_retention_days": 30.5}   |
+        | {"activity_retention_days": "30"}   |
+        | {"activity_retention_days": null}   |
+        | {}                                  |
+        | not json                            |
+
+    Scenario: An admin cannot change it
+      When an admin sends PATCH /v1/settings with body {"activity_retention_days": 30}
+      Then the response is 403 with body "Only the owner can do this."
+      And the stored retention is unchanged
+
+    Scenario Outline: The gate answers before the body is read
+      When PATCH /v1/settings is sent <credentials> with body {"activity_retention_days": 30}
+      Then the response is <status> with body "<body>"
+
+      Examples:
+        | credentials                  | status | body                                                  |
+        | without a jwt cookie         | 401    | You must be logged in to access this resource.        |
+        | with an owner's API key      | 403    | This action needs a real session.                     |
+        | with an unverified owner     | 403    | You must verify your account to access this resource. |
+
+    Scenario: A change is recorded as a system event by the owner
+      Given the stored retention is 90
+      When the owner sends PATCH /v1/settings with body {"activity_retention_days": 30}
+      Then one event exists with action "system.activity_retention_changed", category "system", actor the owner, source "web", outcome "success", security false and params {"from": 90, "to": 30}
+
+    Scenario: Setting the same value records nothing
+      Given the stored retention is 90
+      When the owner sends PATCH /v1/settings with body {"activity_retention_days": 90}
+      Then the response is 200 and no event is recorded
+
+  Rule: A daily cleanup removes events past the retention period
+
+    Background:
+      Given the cleanup is a use case with a Tick(now) like PurgeScheduler, driven by the scheduler runner with hand-fed channels and an injected clock
+      And the server time zone is the injected clock's location
+
+    Scenario Outline: The cleanup is due once a day at or after 03:00
+      Given the retention is 90 and the last cleanup was at <last>
+      When Tick runs at <now>
+      Then ran is <ran>
+
+      Examples:
+        | last                | now                 | ran   |
+        | never               | 2026-10-06T02:59:00 | false |
+        | never               | 2026-10-06T03:00:00 | true  |
+        | never               | 2026-10-06T14:00:00 | true  |
+        | 2026-10-05T03:00:00 | 2026-10-06T02:59:00 | false |
+        | 2026-10-05T03:00:00 | 2026-10-06T03:00:00 | true  |
+        | 2026-10-06T03:00:00 | 2026-10-06T04:00:00 | false |
+        | 2026-10-06T03:00:00 | 2026-10-07T03:00:00 | true  |
+
+    Scenario: Forever never runs
+      Given the retention is 0
+      When Tick runs at 2026-10-06T03:00:00
+      Then ran is false and DeleteOlderThan is not called
+
+    Scenario: The cutoff is now minus the retention days
+      Given the retention is 30 and events at 40, 31, 29 and 1 days ago
+      When the cleanup runs at 2026-10-06T03:00:00
+      Then the events 31 and 40 days old are removed and the others remain
+      And the last cleanup time is the clock's time and the removed count is 2
+
+    Scenario: The last 24 hours are never removed
+      Given the cleanup is asked for a cutoff newer than 24 hours ago
+      Then the effective cutoff is 24 hours before now
+
+    Scenario: A cleanup that removes nothing still records the run
+      Given the retention is 90 and no event is older than 90 days
+      When the cleanup runs
+      Then the last cleanup time is the clock's time, the removed count is 0 and no system.activity_cleanup event is recorded
+
+    Scenario: A cleanup that removes events records a system event after deleting
+      Given 142 events older than the retention
+      When the cleanup runs
+      Then one event exists with action "system.activity_cleanup", category "system", actor type "system", source "system", ip null, user_agent null, outcome "success" and params {"removed": 142}
+      And that event is not among the removed ones
+
+    Scenario: A failing delete is retried at the next tick
+      Given DeleteOlderThan fails
+      When Tick runs
+      Then the error is returned and logged, the last cleanup fields are unchanged and the next tick runs the cleanup again
+
+    Scenario: A shortened period applies at the next cleanup
+      Given the retention was 90 and the owner sets 30
+      Then no event is removed by the change itself
+      And the next cleanup removes events older than 30 days
+
+    Scenario: The scheduler stops with the process
+      When the context is cancelled
+      Then the runner returns and no goroutine outlives it
+
+  Rule: The first producers record the right events
+
+    Scenario Outline: Authentication events
+      When <trigger>
+      Then one event exists with action "<action>", category "auth", <actor>, source "web", outcome "<outcome>", security <security>, failure_reason <reason> and the request ip and user agent
+
+      Examples:
+        | trigger                                                          | action                        | actor                                           | outcome | security | reason                        |
+        | POST /v1/auth/login with the right username and password         | auth.login                    | actor user with the account's name              | success | false    | null                          |
+        | POST /v1/auth/login with the right username and a wrong password | auth.login_failed             | actor anonymous named by the attempted username | failed  | true     | "Wrong username or password." |
+        | POST /v1/auth/login with an unknown username                     | auth.login_failed             | actor anonymous named by the attempted username | failed  | true     | "Wrong username or password." |
+        | POST /v1/auth/logout with a valid jwt cookie                     | auth.logout                   | actor user                                      | success | false    | null                          |
+        | POST /v1/auth/password-reset for an existing account             | auth.password_reset_requested | actor user                                      | success | true     | null                          |
+        | POST /v1/auth/password-reset/confirm with a valid code           | auth.password_reset_completed | actor user                                      | success | true     | null                          |
+
+    Scenario: A failed login reveals no more than the response does
+      Given a wrong password for an existing user and an unknown username
+      Then both events have the same failure_reason, actor type anonymous and no target
+      And neither event holds the password
+
+    Scenario Outline: Nothing is recorded when nothing happened
+      When <trigger>
+      Then no event is recorded and the response is unchanged
+
+      Examples:
+        | trigger                                                  |
+        | POST /v1/auth/logout without a jwt cookie                |
+        | POST /v1/auth/password-reset for an unknown email        |
+        | POST /v1/auth/password-reset/confirm with an invalid code |
+        | POST /v1/auth/login with a body that fails validation    |
+        | POST /v1/auth/login answered 429 by the rate limiter     |
+
+    Scenario: A reset event never holds the code
+      When a password reset is requested and completed
+      Then neither event nor the process log contains the raw code, its hash or the new password
+
+    Scenario: Creating an API key is recorded
+      When the owner sends POST /v1/api-key with a name "Deploy bot"
+      Then one event exists with action "api_key.create", category "api_keys", actor the owner, source "web", target {"type": "api_key", "id": "<new id>", "name": "Deploy bot"}, outcome "success" and security false
+      And no stored field and no response of the activity API contains the raw key or its hash
+
+    Scenario: Revoking an API key is recorded
+      Given the API key 7 named "Deploy bot"
+      When the owner sends DELETE /v1/api-key/7
+      Then one event exists with action "api_key.revoke", category "api_keys", actor the owner, target {"type": "api_key", "id": "7", "name": "Deploy bot"} and outcome "success"
+
+    Scenario: A revoke of an unknown key records nothing
+      When the owner sends DELETE /v1/api-key/99
+      Then the response is 404 and no event is recorded
+
+    Scenario: The recorded events are readable through the API
+      Given a failed login, an API key creation and a retention change were recorded
+      When the owner sends GET /v1/activity
+      Then the three events are listed newest first with their documented items
+      And GET /v1/activity?security=true lists only the failed login

features/activity-log-backend.qa.md

@@ -0,0 +1,72 @@
+# QA procedure: activity-log-backend
+
+Go only, no SPA. Package `test` (black-box), new files `test/activity_log_domain_test.go`, `test/activity_log_persistence_test.go`, `test/activity_log_http_test.go` and `test/activity_cleanup_test.go`. Fake and helper type names must be unique across the package. No live server, no real SMTP, no real SQLite file, no real sleeping, no `time.Ticker`. No env var is added. Never put a secret value in a test name or log assertion helper beyond the fixed test strings.
+
+## Setup shared by every case
+1. `validator.InitValidator()` once. `jwtauth.New("HS256", []byte("test-secret"), nil)` standing in for `JWT_SECRET`.
+2. Fakes: `fakeAuditClock` (mutable, `Now()` and `Set(t)`, UTC), `mockAuditRepo` (in-memory slice, `Append`, `List`, `Summary`, `DeleteOlderThan`, failure and panic switches, call counters per method), existing `mockUserRepo` extended with users: owner 1, admin 2, a verified user 3 with role `"editor"` (domain has only owner and admin, so the role is a plain string in the fake), an unverified user 4. Fake API key repo with key 7 "Deploy bot" and a raw key built with `apikey.RawKeyPrefix`.
+3. Router: a fresh `chi.NewRouter()` mirroring `api/router.go`. Mount `/activity` (RequireSession, `jwtauth.Verifier`, `jwtauth.Authenticator`, `RequireCurrentToken`, `RequireVerifiedUser`, then the audit context middleware), `/settings` with the new PATCH, `/api-key` and `/auth` over the real use cases and the fakes. `httptest.NewRecorder` per request. Cookies are real `jwt` cookies signed with the test token carrying `user_id` and `token_version`.
+4. Capture the standard log with `log.SetOutput(&buf)` and restore with `t.Cleanup`. No parallel tests except where `-race` is stated.
+5. Seed helper `seedEvents(repo, n, spec)` building events with explicit `created_at` from the clock.
+
+## A. Domain (no HTTP)
+6. Vocabulary table: for each of actor type, category, outcome, source and change kind, the exported constants equal the allowed set from the feature; an invalid value is rejected by the domain constructor or validator with the matching `Err` sentinel (`errors.Is`).
+7. Append-only guard: `reflect.TypeOf((*audit.Repository)(nil)).Elem()` has exactly `Append`, `List`, `Summary`, `DeleteOlderThan`. The persistence implementation's exported method set (via `reflect`) equals the same four. Router walk (`chi.Walk`) finds only GET under `/v1/activity`.
+8. Recorder: with `mockAuditRepo` failing (`errors.New("disk full")`), `Record` returns without error, and `buf` names the failed write and `disk full`. A panicking repo is recovered. A context holding actor, source, ip and user agent fills an event that lacks them; an event that already has an actor keeps it. `created_at` equals `fakeAuditClock.Now()` in UTC.
+
+## B. Persistence (real in-memory SQLite, same model list as `api/dependecyInjection.go` and `migrate.go`)
+9. Migrate, then query `sqlite_master` and assert the table and three indexes: `created_at`; `(actor_type, actor_id, created_at)`; `(category, created_at)`. Assert the audit model is in the `migrate.go` list (migrate the full list, not just the audit model).
+10. Round-trip: append an event with params, changes (text and body kinds) and a null failure_reason; `List` returns equal fields. A system event round-trips with null ip and user agent.
+11. Order: three events with identical `created_at` come back by id descending, older last.
+12. Filter table from the feature (actor user, key, system, category, outcome, security, `q` case-insensitive, `q` containing `%` and `_` matched literally, date range inclusive of the whole `to` day UTC). Assert items and total for each.
+13. Paging: 60 events, page 2 size 25 gives items 26-50 and total 60; page 9 gives empty items and total 60.
+14. Summary: events in the last 7 days and the 7 days before; assert total, previous_total, failed, security, distinct user and key counts (anonymous and system excluded) and the four seven-element series, oldest first.
+15. `DeleteOlderThan`: events at 100, 40, 31, 29, 1 days; cutoff 30 days; returns 3, remaining ids as expected.
+16. Portability: assert no raw dialect-specific SQL (`ILIKE`, `strftime`, `date_trunc`, backticks) appears in the repository source. Cross-database run is manual (see below).
+
+## C. Audit context middleware (probe handler echoing the context as JSON)
+17. Table: valid cookie for user 3 gives `{type user, id 3, name, source web}`; valid `Authorization: Bearer <key>` gives `{api_key, 7, "Deploy bot", source api_key}`; none gives anonymous and web.
+18. IP table with `TrustedProxyRealIP([]string{"10.0.0.5"})` in front: trusted peer plus `X-Real-IP` gives the header; untrusted peer ignores it; no header gives the peer. User agent of 400 characters is cut to 255.
+
+## D. Read endpoints (HTTP)
+19. Gate table: no cookie 401 `You must be logged in to access this resource.`; API key 403 `This action needs a real session.`; unverified cookie 403 `You must verify your account to access this resource.`, each for list, summary and export, with `mockAuditRepo` List/Summary counters at 0.
+20. Roles: owner and admin see all actors; user 3 sees only its own with `total` of its own count; `actor=user:3` is 200, `actor=user:2`, `actor=key:7`, `actor=system` are 403 (body `Only owners and admins can do this.`); summary and export for user 3 are 403 with the same body.
+21. Shape: decode the first item into a map and compare with the JSON in the feature, including `"failure_reason": null`, `"params": {}`, integer `actor.id`, string `target.id`, `exists`. System event has `actor.id` null, `ip` null, `user_agent` null. Renamed and deleted user keeps the snapshot name. `exists` table with fake article repo (present, deleted) and user repo (deleted). A `body` change has `delta` and no `before` or `after`.
+22. Query table: every row of the filter outline, asserted against the seeded set; default range 7d (2-day event in, 10-day event out); default `page` 1, `size` 25.
+23. 400 table: every invalid query row gives exactly `The request cannot be processed due to a mismatch in the format of the body.` with the repo read counter at 0.
+24. Summary: the 7d example (12 / 10 / 2 users + 1 key / 3 / 2 and seven-length series that sum to the total); empty log all zeros; custom range previous period is the 7 days immediately before; invalid range 400.
+25. Export: status 200, `Content-Type: text/csv; charset=utf-8`, `Content-Disposition` begins `attachment`. Parse with `encoding/csv`: header `when,actor,action,target,outcome,source,ip`, row values as in the feature, no changes and no user agent column, system ip cell empty. Formula table (`=cmd`, `+1+1`, `-2`, `@SUM(A1)` get a leading `'`; `Spring release` and `a=b` untouched). A name with comma, quotes and a newline is one parseable record. `outcome=failed&page=2&size=25` returns only failed rows. 1200 events yield 1200 rows and `mockAuditRepo` saw more than one `List` call with a bounded size. Invalid filter gives 400 with no `Content-Type: text/csv`.
+
+## E. Retention settings (HTTP)
+26. `GET /v1/settings` with no stored row: `activity_retention_days` 90, `activity_last_cleanup_at` null, `activity_last_cleanup_removed` 0, existing fields (`version`) unchanged. With a stored cleanup: values echoed (RFC3339 UTC).
+27. `PATCH` accepts 30, 90, 365, 0 (200, body echoes, a following GET agrees). 400 table: 7, -1, 366, 30.5, `"30"`, null, `{}`, non-JSON, each with the body-mismatch message and the stored value unchanged.
+28. Gate: admin 403 `Only the owner can do this.`; no cookie 401; owner API key 403 `This action needs a real session.`; unverified owner 403 verification text.
+29. Event: PATCH 90 to 30 records one `system.activity_retention_changed` event with actor owner, source web and params `{"from":90,"to":30}`; PATCH to the same value records none.
+
+## F. Cleanup scheduler (no HTTP, hand-fed channels, `fakeAuditClock`)
+30. Tick table from the feature (never/last cleanup versus now, boundary at exactly 03:00, same-day second tick not due, next-day tick due). Assert `ran` and the `DeleteOlderThan` call count. Retention 0 never calls it.
+31. Cutoff: retention 30, events at 40, 31, 29, 1 days; run at 03:00; 31 and 40 removed; `last_cleanup_at` equals the clock; removed count 2. A request for a cutoff inside 24 hours is clamped to now minus 24 hours.
+32. Zero removed: fields updated, no `system.activity_cleanup` event. 142 removed: one event with action `system.activity_cleanup`, actor type system, source system, ip and user agent null, params `{"removed":142}`, and it is not deleted by the run that created it.
+33. `DeleteOlderThan` failure: Tick returns the error, last-cleanup fields unchanged, the log buffer holds the error, the next Tick runs again after healing.
+34. Runner: one tick runs one Tick; cancelling the context returns `Run` within a timeout; a done channel proves no goroutine outlives it (`-race`).
+35. Shortening retention from 90 to 30 deletes nothing at PATCH time (repo `DeleteOlderThan` counter 0); the next due Tick deletes older than 30.
+
+## G. Producers (HTTP)
+36. Login: right credentials gives `auth.login` (actor user, source web, security false, failure_reason null, ip and user agent from the request); wrong password and unknown username give `auth.login_failed` with actor anonymous named by the attempted username, outcome failed, security true, failure_reason `Wrong username or password.`, identical for both; validation failure and a rate-limited 429 record nothing. No stored field or log line contains the password.
+37. Logout with a valid cookie gives `auth.logout`; without a cookie records nothing.
+38. Password reset: request for an existing account gives `auth.password_reset_requested` (security true); unknown email records nothing and the response is byte-identical to the existing account's response except `Date`; confirm with a valid code gives `auth.password_reset_completed`; invalid code records nothing. Neither the raw code, its hash nor the new password appears in any stored field or in `buf`.
+39. API key: `POST /v1/api-key` records `api_key.create` with the target `{api_key, <id>, name}`; `DELETE /v1/api-key/7` records `api_key.revoke`; `DELETE /v1/api-key/99` is 404 and records nothing. Marshal every stored event and every `/v1/activity` response and assert the raw key and its hash are absent.
+40. Recorder failure on each producer: the HTTP status and body equal those of the same request with a healthy repository.
+41. End to end: record a failed login, a key creation and a retention change, then `GET /v1/activity` lists them newest first, and `?security=true` returns only the failed login.
+
+## H. Layering and hygiene guards
+42. Grep-style test: `internal/domain/audit` imports only the stdlib and other `internal/domain/*`; the audit use cases import no `gorm`, `persistence`, `mailer`, `net/http`, chi or `api/...`; handlers import no `persistence`, `models` or `gorm`; the persistence repository asserts `var _ audit.Repository = &X{}`; the GORM model lives in `persistence/models` with a mapper.
+43. Grep the new and edited files, Go and docs, for comments: none; only tool directives.
+44. Docs read: `docs/api.md` lists the three activity routes, the query parameters, response shapes, the 400/401/403 answers and the PATCH `/v1/settings` contract with the three new GET fields; `docs/architecture.md` describes `domain/audit`, the recorder and context, the persistence model and indexes, and the retention scheduler; `docs/configuration.md` states that retention is stored in the database (default 90) and that no env var was added.
+
+## Manual (not automated)
+45. Real boot with `task dev:api`: log in with a wrong password, log in correctly, create and revoke an API key, PATCH retention as owner (with the session cookie), then read `/v1/activity` and `/v1/activity/export` and open the CSV in a spreadsheet to confirm injected cells show as text.
+46. Behind a reverse proxy with `TRUSTED_PROXIES` containing the proxy: the stored ip is the client's, not the proxy's. Without it: the proxy's.
+47. Backdate events in the SQLite file, set retention to 30 and either wait for 03:00 or move the system clock; confirm removed rows and the new Last cleanup values in `GET /v1/settings`.
+48. Run the persistence suite against a MySQL/MariaDB and a PostgreSQL instance through the documented database settings of `docs/configuration.md`: index creation, case-insensitive `q`, literal `%` and `_`, date-range boundaries, and `DeleteOlderThan` counts.
+49. SIGINT during a cleanup: the process exits after the run ends, with no database error on close.

features/activity-log-producers.feature

@@ -0,0 +1,506 @@
+Feature: Every real action of the back-office is recorded in the activity log from inside its use case
+
+  As the owner of a RenewCMS site
+  I want articles, media, users and invites, and system tasks to leave an activity event
+  So that the Activity screen shows who did what, and a failed attempt says why in plain words
+
+  Background:
+    Given the spec of record is docs/design/screens/activity.md ("What is recorded", "API contract") and the foundation slice features/activity-log-backend.feature
+    And this slice is backend only: no SPA, no new env var, no new table, no change to docs/design
+    And events are recorded by the use cases through audit.Recorder, never by handlers, middleware or GORM hooks
+    And every mutating use case method takes the request context as its first parameter and hands it to Recorder.Record, which fills actor, source, ip and user agent from the audit context
+    And system events set the system actor and source "system" themselves, with ip and user_agent null
+    And an event is recorded once, after the change was made (success) or after the use case decided to refuse or abort it (failed), never before
+    And no read is recorded: no GET, no list, no public article read, no status poll
+    And error responses are plain text from http.Error and success responses are JSON with snake_case fields, unchanged by this slice
+    And the layering rule holds: use cases see only domain interfaces, no comment is added anywhere
+
+  Rule: The audit context reaches every producing route
+
+    Scenario Outline: A producing route carries the origin of the request
+      When <request> is sent with <credentials>
+      Then the stored event has actor <actor>, source "<source>" and the request ip and user agent
+
+      Examples:
+        | request                      | credentials            | actor                            | source  |
+        | POST /v1/article             | the owner's jwt cookie | the owner, named by display name | web     |
+        | POST /v1/article             | an API key "Deploy bot"| api_key id 7 named "Deploy bot"  | api_key |
+        | POST /v1/media               | an API key "Deploy bot"| api_key id 7 named "Deploy bot"  | api_key |
+        | POST /v1/system/update/check | the owner's jwt cookie | the owner                        | web     |
+
+  Rule: A failed audit write never changes the user's action
+
+    Scenario Outline: A failing or panicking repository leaves the response untouched
+      Given the audit repository <fault> on Append
+      When <request> succeeds
+      Then the response status and body equal those of the same request with a healthy repository
+      And the change itself was applied
+      And the process log names the failed audit write
+
+      Examples:
+        | fault  | request                        |
+        | fails  | POST /v1/article               |
+        | fails  | DELETE /v1/article/8           |
+        | panics | PATCH /v1/article/8/publish    |
+        | fails  | POST /v1/media                 |
+        | fails  | POST /v1/media/merge           |
+        | fails  | POST /v1/user/invite           |
+        | fails  | POST /v1/system/update/restart |
+
+  Rule: Articles
+
+    Scenario: Creating an article is recorded
+      When the owner sends POST /v1/article with {"title": "Spring release", "body": "Hello"}
+      Then one event exists with action "article.create", category "articles", actor the owner, source "web", target {"type": "article", "id": "<new id>", "name": "Spring release"}, outcome "success", failure_reason null and no changes
+      And the stored event holds no article body
+
+    Scenario: Editing the body records a size delta and never the text
+      Given the article 8 "Spring release" has a body of 100 characters
+      When the owner sends PATCH /v1/article/8 with a body of 412 characters
+      Then one event exists with action "article.edit", target {"type": "article", "id": "8", "name": "Spring release"} and changes [{"field": "body", "kind": "body", "delta": 312}]
+      And no stored field and no /v1/activity response contains any text of either body
+
+    Scenario Outline: The delta is signed and counts characters
+      Given the article 8 has a body of <before> characters
+      When its body is replaced by one of <after> characters
+      Then the change delta is <delta>
+
+      Examples:
+        | before | after | delta |
+        | 100    | 412   | 312   |
+        | 412    | 100   | -312  |
+        | 5      | 5     | 0     |
+
+    Scenario: A body with multi-byte characters is counted in characters
+      Given the article 8 has the body "héllo"
+      When its body is replaced by "héllo wörld"
+      Then the change delta is 6
+
+    Scenario: Saving an identical body records nothing
+      Given the article 8 has the body "Same text"
+      When the owner sends PATCH /v1/article/8 with the body "Same text"
+      Then the response is 200 and no event is recorded
+
+    Scenario: A title change is recorded as a text diff when a title edit exists
+      Given a use case that changes an article's title from "Spring release" to "Spring release 2"
+      Then its event has action "article.edit" and changes [{"field": "title", "kind": "text", "before": "Spring release", "after": "Spring release 2"}]
+      And only the fields title, online and body can ever appear in an article event's changes
+
+    Scenario: Publishing is recorded with the publish state
+      Given the article 8 "Spring release" is offline
+      When the owner sends PATCH /v1/article/8/publish
+      Then one event exists with action "article.publish", category "articles" and changes [{"field": "online", "kind": "text", "before": "false", "after": "true"}]
+
+    Scenario: Unpublishing is recorded with the publish state
+      Given the article 8 is online
+      When the owner sends PATCH /v1/article/8/unpublish
+      Then one event exists with action "article.unpublish" and changes [{"field": "online", "kind": "text", "before": "true", "after": "false"}]
+
+    Scenario Outline: A publish state that does not change records nothing
+      Given the article 8 is <state>
+      When the owner sends PATCH /v1/article/8/<path>
+      Then the response is 200 and no event is recorded
+
+      Examples:
+        | state   | path      |
+        | online  | publish   |
+        | offline | unpublish |
+
+    Scenario: Deleting an article is recorded with its name snapshot
+      Given the article 8 "Spring release" exists
+      When the owner sends DELETE /v1/article/8
+      Then one event exists with action "article.delete", target {"type": "article", "id": "8", "name": "Spring release"} and outcome "success"
+      And GET /v1/activity shows that target with exists false
+
+    Scenario Outline: A refused article action is recorded as failed with a plain reason
+      Given <state>
+      When <request>
+      Then one event exists with action "<action>", outcome "failed" and failure_reason "<reason>"
+      And the response is unchanged
+
+      Examples:
+        | state                                    | request                                    | action          | reason                                              |
+        | no article has this title                | POST /v1/article with a 2 character title  | article.create  | The title must be between 3 and 200 characters.     |
+        | the repository fails with "db is locked" | POST /v1/article with a valid title        | article.create  | Something went wrong on our side. Please try again. |
+        | the repository fails with "db is locked" | PATCH /v1/article/8/publish                | article.publish | Something went wrong on our side. Please try again. |
+
+    Scenario: An article that does not exist records nothing
+      When the owner sends DELETE /v1/article/99, PATCH /v1/article/99, PATCH /v1/article/99/publish and PATCH /v1/article/99/unpublish
+      Then every response is 404 and no event is recorded
+
+    Scenario: A request that fails validation records nothing
+      When the owner sends POST /v1/article with an empty body or a malformed id such as /v1/article/abc
+      Then the response is 400 and no event is recorded
+
+    Scenario Outline: Reads are never recorded
+      When <request> is sent
+      Then no event is recorded
+
+      Examples:
+        | request                         |
+        | GET /v1/article                 |
+        | GET /v1/article/8               |
+        | GET /v1/article/8 as the public |
+
+  Rule: Media
+
+    Scenario: Uploading an image is recorded
+      When the owner sends POST /v1/media with the PNG "spring-banner.png"
+      Then one event exists with action "media.upload", category "media", actor the owner, target {"type": "image", "id": "<new id>", "name": "spring-banner.png"} and outcome "success"
+      And the stored event holds no file content and no storage path
+
+    Scenario Outline: A refused upload is recorded as failed
+      When the owner uploads <file>
+      Then one event exists with action "media.upload", outcome "failed" and failure_reason "<reason>"
+      And the target name is the file name as sent, normalised the way a stored upload would be named, or empty when it is unusable
+      And the response is unchanged
+
+      Examples:
+        | file                        | reason                                           |
+        | a GIF                       | The file must be a PNG, JPEG, WEBP or SVG image. |
+        | a PNG larger than the limit | The file is too large to upload.                 |
+        | a corrupt PNG               | The image could not be read.                     |
+
+    Scenario: Renaming an image records the filename diff
+      Given the image 5 "banner.png"
+      When the owner sends PATCH /v1/media/5 with {"filename": "spring-banner"}
+      Then one event exists with action "media.rename", target {"type": "image", "id": "5", "name": "spring-banner.png"} and changes [{"field": "filename", "kind": "text", "before": "banner.png", "after": "spring-banner.png"}]
+
+    Scenario: Renaming to the same name records nothing
+      Given the image 5 "banner.png"
+      When the owner renames it to "banner"
+      Then no event is recorded
+
+    Scenario: A refused rename is recorded as failed
+      Given the image 5 "banner.png"
+      When the owner sends PATCH /v1/media/5 with an invalid filename
+      Then one event exists with action "media.rename", outcome "failed", failure_reason "That file name is not valid." and target {"type": "image", "id": "5", "name": "banner.png"}
+
+    Scenario: Deleting an image is recorded with its name snapshot
+      Given the image 5 "banner.png"
+      When the owner sends DELETE /v1/media/5
+      Then one event exists with action "media.delete", target {"type": "image", "id": "5", "name": "banner.png"} and outcome "success"
+      And GET /v1/activity shows that target with exists false
+
+    Scenario: Merging images is recorded once with its counts
+      Given the images 5 "banner.png", 6 "banner-copy.png" and 7 "banner-copy-2.png" share one content hash
+      And two articles reference the copies
+      When the owner sends POST /v1/media/merge keeping 5 and merging [6, 7]
+      Then one event exists with action "media.merge", target {"type": "image", "id": "5", "name": "banner.png"} and params {"merged": 2, "articles_updated": 2}
+      And no event names a removed copy as a separate action
+
+    Scenario Outline: A refused merge is recorded as failed
+      When the owner sends POST /v1/media/merge that fails with <error>
+      Then one event exists with action "media.merge", outcome "failed" and failure_reason "<reason>"
+
+      Examples:
+        | error                  | reason                              |
+        | ErrInvalidMergeRequest | The merge request is not valid.     |
+        | ErrMergeCopyMissing    | One of the copies no longer exists. |
+        | ErrMergeHashMismatch   | The images are not identical copies.|
+
+    Scenario: A manual purge is recorded once and not as separate merges
+      Given a purge plan with 2 groups, 3 copies and 5 articles to update
+      When the owner sends POST /v1/media/purge
+      Then one event exists with action "media.purge", category "media", actor the owner, source "web", outcome "success" and params {"merged": 3, "articles_updated": 5}
+      And no "media.merge" event is recorded for its groups
+
+    Scenario: A partly failed manual purge is a success with the failed group count
+      Given a purge plan with 3 groups where 1 group fails
+      When the owner sends POST /v1/media/purge
+      Then one event exists with action "media.purge", outcome "success" and params that include "failed_groups": 1
+
+    Scenario Outline: A refused manual purge is recorded as failed
+      When the owner sends POST /v1/media/purge and the use case returns <error>
+      Then one event exists with action "media.purge", outcome "failed" and failure_reason "<reason>"
+
+      Examples:
+        | error            | reason                                                  |
+        | ErrPurgeConflict | The library changed since the preview. Review it again. |
+        | ErrPurgeBusy     | A purge is already running.                             |
+
+    Scenario: The scheduled purge is a system event
+      Given the purge is due and merges 3 copies and updates 5 articles
+      When PurgeSchedulerUseCase.Tick runs
+      Then one event exists with action "system.media_purge", category "system", actor type system named "System", source "system", ip null, user_agent null, outcome "success" and params {"merged": 3, "articles_updated": 5}
+
+    Scenario: A scheduled purge with a failed group records the failed group count
+      Given the purge is due and 1 group fails while others merge
+      When Tick runs
+      Then one event exists with action "system.media_purge", outcome "success" and params that include "failed_groups": 1
+
+    Scenario: A scheduled purge that is not due or merges nothing records nothing
+      Given the purge is not due, or is due and finds no duplicate
+      When Tick runs
+      Then no event is recorded
+
+    Scenario: A scheduled purge that cannot record its run is a failed system event
+      Given the purge is due and the run result cannot be saved
+      When Tick runs
+      Then one event exists with action "system.media_purge", outcome "failed" and failure_reason "Something went wrong on our side. Please try again."
+
+    Scenario: Browsing and the media usage lookup are never recorded
+      When the owner sends GET /v1/media, GET /v1/media/5/usage, GET /v1/media/purge-preview and GET /v1/media/purge-settings
+      Then no event is recorded
+
+  Rule: Users and invites
+
+    Scenario: Registering is recorded with the new account as actor
+      Given registration is open
+      When POST /v1/auth/register is sent with the username "marta"
+      Then one event exists with action "user.register", category "users", actor user "marta" with the new id, source "web", target {"type": "user", "id": "<new id>", "name": "marta"} and outcome "success"
+      And the stored event holds no password, no hash and no verification code
+
+    Scenario Outline: A refused registration is recorded as failed
+      When POST /v1/auth/register is sent and <cause>
+      Then one event exists with action "user.register", outcome "failed", failure_reason "<reason>", actor anonymous named by the attempted username and no target
+      And the response is unchanged
+
+      Examples:
+        | cause                                 | reason                                    |
+        | registration is closed                | Registration is closed on this site.      |
+        | the verification email cannot be sent | The verification email could not be sent. |
+
+    Scenario: Verifying an account is recorded
+      Given the unverified user 4 "lea" with a valid code
+      When user 4 sends POST /v1/auth/verify with that code
+      Then one event exists with action "user.verify", category "users", actor user 4, target {"type": "user", "id": "4", "name": "lea"} and outcome "success"
+      And the stored event does not hold the code or its hash
+
+    Scenario Outline: A refused verification is recorded as failed
+      Given the unverified user 4 "lea"
+      When user 4 sends POST /v1/auth/verify and the use case returns <error>
+      Then one event exists with action "user.verify", outcome "failed" and failure_reason "<reason>"
+
+      Examples:
+        | error                      | reason                              |
+        | ErrInvalidVerificationCode | The verification code is not valid. |
+        | ErrVerificationCodeExpired | The verification code has expired.  |
+
+    Scenario: Changing the display name records a before and after
+      Given user 3 has the display name "Marta"
+      When user 3 sends PATCH /v1/user/me with {"display_name": "Marta Alves"}
+      Then one event exists with action "user.update_profile", category "users", target {"type": "user", "id": "3", "name": "Marta Alves"} and changes [{"field": "display_name", "kind": "text", "before": "Marta", "after": "Marta Alves"}]
+      And the actor snapshot name is the name held when the request began
+
+    Scenario Outline: Setting a display name that does not change records nothing
+      Given user 3 has the display name "<current>"
+      When user 3 sends PATCH /v1/user/me with {"display_name": "<sent>"}
+      Then no event is recorded
+
+      Examples:
+        | current | sent    |
+        | Marta   | Marta   |
+        | Marta   |  Marta  |
+        |         |         |
+
+    Scenario: A display name that is too long is recorded as failed
+      When user 3 sends PATCH /v1/user/me with a 61 character name
+      Then one event exists with action "user.update_profile", outcome "failed" and failure_reason "That display name is too long."
+      And the stored event holds no changes
+
+    Scenario: Creating an invite is recorded
+      When the owner sends POST /v1/user/invite with {"email": "new@example.com"}
+      Then one event exists with action "invite.create", category "users", actor the owner, target {"type": "invite", "id": "<invite id>", "name": "new@example.com"} and outcome "success"
+      And the stored event holds no invite code and no hash
+
+    Scenario Outline: A refused invite action is recorded as failed
+      When the owner <request> and the use case returns <error>
+      Then one event exists with action "<action>", outcome "failed" and failure_reason "<reason>"
+
+      Examples:
+        | request                            | error                    | action        | reason                                           |
+        | sends POST /v1/user/invite         | ErrEmailHasAccount       | invite.create | That email already has an account.               |
+        | sends POST /v1/user/invite         | ErrPendingInvite         | invite.create | An invitation is already pending for that email. |
+        | sends POST /v1/user/invite         | ErrInviteEmailNotSent    | invite.create | The invitation email could not be sent.          |
+        | sends POST /v1/user/invite/4/renew | ErrInviteEmailNotSent    | invite.renew  | The invitation email could not be sent.          |
+        | sends POST /v1/user/invite/4/renew | ErrInviteAlreadyAccepted | invite.renew  | That invitation was already accepted.            |
+        | sends DELETE /v1/user/invite/4     | ErrInviteAlreadyAccepted | invite.cancel | That invitation was already accepted.            |
+
+    Scenario: Cancelling an invite is recorded
+      Given the pending invite 4 for "new@example.com"
+      When the owner sends DELETE /v1/user/invite/4
+      Then one event exists with action "invite.cancel", target {"type": "invite", "id": "4", "name": "new@example.com"} and outcome "success"
+
+    Scenario: Renewing an invite is recorded
+      Given the pending invite 4 for "new@example.com"
+      When the owner sends POST /v1/user/invite/4/renew
+      Then one event exists with action "invite.renew", target {"type": "invite", "id": "4", "name": "new@example.com"} and outcome "success"
+      And a renewal whose email fails is rolled back and recorded only as failed
+
+    Scenario: Accepting an invite is recorded with the new account as actor
+      Given the pending invite 4 for "new@example.com"
+      When POST /v1/auth/invite/accept is sent with a valid code and the username "sam"
+      Then one event exists with action "invite.accept", category "users", actor user "sam" with the new id, source "web", target {"type": "invite", "id": "4", "name": "new@example.com"} and outcome "success"
+      And the stored event holds no code, no hash and no password
+
+    Scenario Outline: A refused acceptance is recorded as failed
+      When POST /v1/auth/invite/accept is sent and the use case returns <error>
+      Then one event exists with action "invite.accept", outcome "failed", failure_reason "<reason>" and actor anonymous named by the attempted username
+      And the stored event has no target when the invite could not be identified
+
+      Examples:
+        | error                    | reason                                |
+        | ErrInviteInvalid         | That invitation is not valid.         |
+        | ErrInviteExpired         | That invitation has expired.          |
+        | ErrInviteAlreadyAccepted | That invitation was already accepted. |
+        | ErrUsernameTaken         | That username is already taken.       |
+        | ErrEmailHasAccount       | That email already has an account.    |
+
+    Scenario: An invite or user that does not exist records nothing
+      When the owner sends DELETE /v1/user/invite/99 or POST /v1/user/invite/99/renew
+      Then every response is 404 and no event is recorded
+
+    Scenario Outline: Reads and checks are never recorded
+      When <request> is sent
+      Then no event is recorded
+
+      Examples:
+        | request                         |
+        | GET /v1/user                    |
+        | GET /v1/auth/me                 |
+        | GET /v1/auth/invite?code=<code> |
+        | GET /v1/auth/registration       |
+
+  Rule: System tasks
+
+    Scenario: Checking for an update is recorded
+      Given the release feed answers v1.4.0 while the running version is v1.3.2
+      When the owner sends POST /v1/system/update/check
+      Then one event exists with action "system.update_checked", category "system", actor the owner, source "web", target {"type": "release", "id": "v1.4.0", "name": "v1.4.0"}, outcome "success" and params {"update_available": true}
+
+    Scenario Outline: A failed update check is recorded with a plain reason
+      When the owner sends POST /v1/system/update/check and the use case returns <error>
+      Then one event exists with action "system.update_checked", outcome "failed", failure_reason "<reason>" and no target
+
+      Examples:
+        | error              | reason                                 |
+        | ErrFeedUnavailable | The release feed could not be reached. |
+        | ErrNoRelease       | No release was found.                  |
+
+    Scenario: The status poll is never recorded
+      When the owner sends GET /v1/system/update
+      Then no event is recorded
+
+    Scenario: A download that completes is recorded when the job is ready
+      Given a newer release v1.4.0 is available and the update helper is installed
+      When the owner sends POST /v1/system/update/download
+      Then the response is returned before the job ends and no event exists yet
+      And when the job reaches the ready state one event exists with action "system.update_downloaded", actor the owner, source "web", target {"type": "release", "id": "v1.4.0", "name": "v1.4.0"} and outcome "success"
+      And the origin (actor, ip, user agent) is the one captured at request time
+
+    Scenario Outline: A download that fails is recorded with a reason that hides the cause
+      Given a newer release v1.4.0 is available and the job fails with the error kind "<kind>"
+      Then one event exists with action "system.update_downloaded", outcome "failed" and failure_reason "<reason>"
+      And the stored event holds no url, no path and no raw error text
+
+      Examples:
+        | kind         | reason                                            |
+        | download     | The update could not be downloaded.               |
+        | verification | The downloaded update failed its integrity check. |
+
+    Scenario Outline: A download refused at the start is recorded as failed
+      When the owner sends POST /v1/system/update/download and the use case returns <error>
+      Then one event exists with action "system.update_downloaded", outcome "failed" and failure_reason "<reason>"
+      And the response is unchanged
+
+      Examples:
+        | error               | reason                                 |
+        | ErrNotPrepared      | This server cannot apply updates.      |
+        | ErrJobInProgress    | An update is already being downloaded. |
+        | ErrRestartPending   | A restart is already pending.          |
+        | ErrNothingToUpdate  | There is nothing to update.            |
+        | ErrPreflightRefused | The update cannot be downloaded.       |
+
+    Scenario: A restart request is recorded
+      Given the update helper is installed and no job is running
+      When the owner sends POST /v1/system/update/restart
+      Then one event exists with action "system.restart_requested", category "system", actor the owner, source "web", outcome "success" and params {"kind": "restart"}
+
+    Scenario: A restart that applies a downloaded update records the kind and version
+      Given a downloaded update v1.4.0 is ready
+      When the owner sends POST /v1/system/update/restart
+      Then the event has params {"kind": "update", "tag": "v1.4.0"}
+
+    Scenario Outline: A refused restart is recorded as failed
+      When the owner sends POST /v1/system/update/restart and the use case returns <error>
+      Then one event exists with action "system.restart_requested", outcome "failed" and failure_reason "<reason>"
+
+      Examples:
+        | error                  | reason                                                 |
+        | ErrNotPrepared         | This server cannot apply updates.                      |
+        | ErrJobInProgress       | An update is still being downloaded.                   |
+        | ErrRestartPending      | A restart is already pending.                          |
+        | ErrRestartKindMismatch | The requested restart does not match the server state. |
+
+  Rule: A failed outcome never exposes more than the plain-language reason
+
+    Scenario: Failure reasons are mapped from domain sentinels
+      Given a table that maps each domain Err sentinel above to a fixed sentence
+      When a use case fails with an error that wraps one of them
+      Then failure_reason is that sentence, matched with errors.Is
+
+    Scenario Outline: Unmapped errors become the generic sentence
+      When a use case fails with <error>
+      Then failure_reason is "Something went wrong on our side. Please try again."
+      And neither the event, the activity API nor the CSV export holds the text of the error
+
+      Examples:
+        | error                                        |
+        | errors.New("db is locked")                   |
+        | an error carrying an SMTP host and password  |
+        | an error carrying a file system path        |
+        | an error wrapping a sentinel and a raw cause |
+
+    Scenario: Every failure reason fits the stored limit
+      Then every mapped sentence is at most 255 characters
+
+    Scenario: A failed event keeps its target when the target is known
+      Given the image 5 "banner.png" exists
+      When a rename of image 5 is refused
+      Then the failed event keeps the target snapshot of image 5
+
+  Rule: Secrets and bodies never reach the log
+
+    Scenario Outline: Sensitive values are absent everywhere
+      Given the action <action> handled <secret>
+      When it is recorded, listed through GET /v1/activity and exported through GET /v1/activity/export
+      Then no stored field, no params, no change, no response, no CSV cell and no process log line contains <secret>
+
+      Examples:
+        | action                   | secret                                           |
+        | user.register            | the password, its hash and the verification code |
+        | user.verify              | the verification code and its hash               |
+        | invite.create            | the invite code and its hash                     |
+        | invite.accept            | the invite code, its hash and the password       |
+        | article.edit             | the old and the new article body                 |
+        | media.upload             | the file bytes and the storage path              |
+        | system.update_downloaded | the asset url and the staging path               |
+
+    Scenario: Only allowlisted fields appear in changes
+      Then the only change fields any producer emits are title, online, body, filename and display_name
+      And the only change kinds are text and body
+
+  Rule: The recorded events read back through the existing API
+
+    Scenario: Producer events are listed with their documented shape
+      Given an article was created, edited, published and deleted by the owner
+      When the owner sends GET /v1/activity?category=articles
+      Then the four events are listed newest first, with category "articles", the documented item shape and the article target exists false after the delete
+
+    Scenario Outline: Categories filter the producers
+      Given one event of each producer was recorded
+      When the owner sends GET /v1/activity?category=<category>
+      Then the items are exactly the events listed in <actions>
+
+      Examples:
+        | category | actions                                                                                                    |
+        | articles | article.create, article.edit, article.publish, article.unpublish, article.delete                           |
+        | media    | media.upload, media.rename, media.delete, media.merge, media.purge                                         |
+        | users    | user.register, user.verify, user.update_profile, invite.create, invite.cancel, invite.renew, invite.accept |
+        | system   | system.media_purge, system.update_checked, system.update_downloaded, system.restart_requested              |
+
+    Scenario: A failed producer event is filterable
+      Given a refused merge and a successful rename were recorded
+      When the owner sends GET /v1/activity?outcome=failed
+      Then only the refused merge is listed with its failure_reason

features/activity-log-producers.qa.md

@@ -0,0 +1,67 @@
+# QA procedure: activity-log-producers
+
+Go only, no SPA. Package `test` (black-box). New files: `test/activity_producers_articles_test.go`, `test/activity_producers_media_test.go`, `test/activity_producers_users_test.go`, `test/activity_producers_system_test.go`, `test/activity_producers_reasons_test.go`. Reuse the foundation helpers in `test/activity_support_test.go` (`mockAuditRepo`, `fakeAuditClock`, `seedEvents`). Extend the existing hand-written fakes (`mockArticleRepo`, the image, user, invite, purge, update and status fakes) with failure switches and call counters. New fake type names must be unique across the package. No live server, no real SMTP, no real SQLite file, no real sleeping, no `time.Ticker`. Secrets in tests are fixed test strings only.
+
+## Setup shared by every case
+1. `validator.InitValidator()` once. `jwtauth.New("HS256", []byte("test-secret"), nil)` stands in for `JWT_SECRET`.
+2. One `auditing.NewRecorder(mockAuditRepo, fakeAuditClock.Now, logger)` shared by every use case. `logger` writes to a `bytes.Buffer` (restore with `t.Cleanup`).
+3. Users: owner 1, admin 2, verified user 3 "Marta", unverified user 4 "lea" (with a hashed code). API key 7 "Deploy bot" in the fake key repo.
+4. A fresh `chi.NewRouter()` per test that mirrors `api/router.go` for the article, user, media, system and auth routers, with `middleware.AuditContext(getUser, trustedProxies)` placed exactly where the router wires it (after `apiKeyAuth()` on the article, user and media routers). Cookies are real signed `jwt` cookies with `user_id` and `token_version`. `httptest.NewRecorder` per request.
+5. Helpers: `eventsOf(repo)`, `onlyEvent(t, repo)` (fails unless exactly one event), `assertNoEvent(t, repo)`.
+6. Each mutating use case method takes `ctx context.Context` first. A method called with a context holding no origin still works.
+
+## A. Origin and routing
+7. Table (feature rule 1): each request with the cookie or the API key yields the expected actor type, id, name and source, plus the request ip and user agent. Proves `AuditContext` is mounted on the article, user, media and system routers.
+8. A route without credentials, or answered 401/403/429, records nothing.
+
+## B. Articles
+9. Create: one `article.create` event, target id string, name as typed, no changes, no body anywhere (marshal the event and assert absence).
+10. Edit: table `(before, after, delta)`: 100 to 412 (312), 412 to 100 (-312), 5 to 5 with different content (0, still recorded), `héllo` to `héllo wörld` (6, characters not bytes). Identical body records nothing. Change kind `body`, `Delta` set, `Before` and `After` nil.
+11. Publish and unpublish: `online` text change (`"false"`/`"true"`). Repeating the same state records nothing and returns 200.
+12. Delete: event keeps the name snapshot. After it, `GET /v1/activity` shows `target.exists` false.
+13. Title diff: unit-test the change builder with title, online and body only; any other field name is rejected.
+14. Failure table: 2 character title, repository failing with `errors.New("db is locked")` (generic reason). 404 on delete, edit, publish, unpublish of id 99 and 400 on malformed id or body record nothing.
+15. Reads (list, get, public get) record nothing.
+
+## C. Media
+16. Upload: in-memory PNG, target name equals the normalised filename, no bytes and no path. Failed upload table: GIF, oversize, corrupt PNG, each with its mapped reason.
+17. Rename: `filename` text change `banner.png` to `spring-banner.png`. Same name records nothing. Invalid stem records a failed event keeping the target. Missing image records nothing (404).
+18. Delete: event with name snapshot. Missing image records nothing.
+19. Merge: three images with one hash, two articles referencing the copies. One `media.merge` event with `{"merged":2,"articles_updated":2}`, target the kept image. Failure table: `ErrInvalidMergeRequest`, `ErrMergeCopyMissing`, `ErrMergeHashMismatch`.
+20. Manual purge: plan with 2 groups, 3 copies, 5 articles. Exactly one `media.purge` event with `{"merged":3,"articles_updated":5}` and zero `media.merge` events. A plan with one failing group: outcome success with `failed_groups` 1. `ErrPurgeConflict` and `ErrPurgeBusy` give failed events. Preview, usage, list and settings GETs record nothing.
+21. Scheduled purge: drive `PurgeSchedulerUseCase.Tick(now)` with the fake purge repo and clock. Due and merging 3: one `system.media_purge` event with system actor, source system, ip nil, user agent nil. Due with a failed group: success with `failed_groups`. Not due, or no duplicates: none. A fake `SaveLastRun` failure: failed event with the generic reason.
+22. Manual purge after the scheduler in the same test yields two events with sources `web` and `system`.
+
+## D. Users and invites
+23. Register: open registration records `user.register` with the new account as actor and target. Closed registration and a failing mailer (error carrying a fake SMTP password) record failed events with the mapped reason, anonymous actor named by the attempted username, no raw text. Marshal the event and assert password, hash and code are absent.
+24. Verify: success, invalid code, expired code.
+25. Display name: before/after diff, trimmed no-op records nothing, empty to empty records nothing, 61 characters records a failed event with no changes. Actor snapshot name is the pre-change name.
+26. Invites: create, cancel, renew, accept each record the documented event with the invited email as target name. Failure table covers every error in the feature. A renew whose mail fails is rolled back and records one failed event only. Unknown ids (404) record nothing.
+27. Accept: actor is the new account, source `web`; failed accept actor is anonymous with the attempted username.
+28. Reads (`GET /v1/user`, `/v1/auth/me`, `/v1/auth/invite`, `/v1/auth/registration`) record nothing.
+
+## E. System tasks
+29. Check: success event with `{"update_available":true}` and a release target. `ErrFeedUnavailable` and `ErrNoRelease` give failed events without target. Status `GET` records nothing.
+30. Download: fakes complete the job through a hand-fed channel (no `time.Sleep`). No event before the job ends, one after `ready`; actor, ip and user agent are those captured at request time even though the request context was cancelled. Failure kinds `download` and `verification` give the two reasons, no URL or path. Start-time refusals give failed events. Run with `-race`.
+31. Restart: `{"kind":"restart"}` and `{"kind":"update","tag":"v1.4.0"}`. Refusals for `ErrNotPrepared`, `ErrJobInProgress`, `ErrRestartPending`, `ErrRestartKindMismatch`.
+
+## F. Reasons, secrets and recorder faults
+32. Reason table: wrap each sentinel with `fmt.Errorf("%w: %w", sentinel, errors.New("secret detail"))`, assert the sentence equals the table and the extra text is absent. Unmapped errors give the generic sentence. Every sentence is at most 255 characters.
+33. Recorder fault: for each producer row of the fault table, run with failing, panicking and healthy `mockAuditRepo`. Identical status and body, change applied, log line naming the failed write.
+34. Secret sweep: after exercising every producer, marshal every stored event, the `/v1/activity` response and the `/v1/activity/export` file; assert none contains the password, hash, verification code, invite code, raw API key, article body, file bytes, asset URL or staging path. The log buffer is free of them too.
+35. Allowlist: every `Change.Field` is in `{title, online, body, filename, display_name}` and every kind is `text` or `body`.
+36. Read-back: list by `category=articles|media|users|system` and `outcome=failed`; compare action sets with the feature tables.
+
+## G. Mutation guard (gremlins stays clean)
+37. `task mutate` scope is `./internal/infrastructure/useCases`. Each new branch needs a killing assertion: every no-op guard (body, online, filename, display name) with equal and differing values; delta sign and rune-versus-byte count; success versus failed outcome and recorded once after the change (event count and order against the repository call); every `errors.Is` row of the reason map plus the generic fallback; every `ctx` forwarding; the system-actor defaults. Bare-bool conditions produce no mutant, so cover both branches with tests regardless.
+
+## H. Layering and hygiene
+38. Touched use cases import no `gorm`, `persistence`, `mailer`, `net/http`, chi or `api/...`; handlers only pass `r.Context()`; `internal/domain/audit` imports only stdlib and domain packages.
+39. No comments in new or edited Go files, test files and docs, except tool directives.
+40. Docs (`docs/api.md`, `docs/architecture.md`) list the action catalogue, target types, reason sentences and the rule that no read is recorded.
+
+## Manual (not automated)
+41. Real boot with `task dev:api` and SMTP: register, verify, invite, renew, accept and cancel an invite, change display name, create/edit/publish/unpublish/delete an article, upload/rename/merge/delete images, manual purge; read `/v1/activity` and the CSV export and read every sentence.
+42. Real update helper on Linux systemd (or the Docker QA flow): check, download until `ready`, restart; one event each, real asset names absent. Skip in a container.
+43. Leave the scheduled purge due and wait for the hourly tick: a single `system.media_purge` event, source `system`, no ip or user agent.
+44. Remove the database file's write access during one article edit: edit result unchanged, process log names the audit write failure.

internal/domain/audit/auditChanges.go

@@ -0,0 +1,30 @@
+package audit
+
+import (
+	"RenewCMS/internal/domain/article"
+	"strconv"
+	"unicode/utf8"
+)
+
+func TextChange(field string, before string, after string) Change {
+	return Change{Field: field, Kind: ChangeText, Before: &before, After: &after}
+}
+
+func BodyChange(before string, after string) Change {
+	delta := utf8.RuneCountInString(after) - utf8.RuneCountInString(before)
+	return Change{Field: FieldBody, Kind: ChangeBody, Delta: &delta}
+}
+
+func ArticleChanges(before article.Article, after article.Article) []Change {
+	changes := []Change{}
+	if before.Title != after.Title {
+		changes = append(changes, TextChange(FieldTitle, before.Title, after.Title))
+	}
+	if before.IsOnline != after.IsOnline {
+		changes = append(changes, TextChange(FieldOnline, strconv.FormatBool(before.IsOnline), strconv.FormatBool(after.IsOnline)))
+	}
+	if before.Body != after.Body {
+		changes = append(changes, BodyChange(before.Body, after.Body))
+	}
+	return changes
+}

internal/domain/audit/auditDomain.go

@@ -0,0 +1,243 @@
+package audit
+
+import (
+	"RenewCMS/internal/domain/user"
+	"errors"
+	"slices"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var ErrInvalidFilter = errors.New("invalid activity filter")
+var ErrInvalidRetention = errors.New("invalid activity retention period")
+var ErrInvalidEvent = errors.New("invalid activity event")
+var ErrActorNotAllowed = errors.New("activity of another actor is not allowed")
+
+type ActorType string
+
+const (
+	ActorUser      ActorType = "user"
+	ActorAPIKey    ActorType = "api_key"
+	ActorSystem    ActorType = "system"
+	ActorAnonymous ActorType = "anonymous"
+)
+
+type Category string
+
+const (
+	CategoryArticles Category = "articles"
+	CategoryMedia    Category = "media"
+	CategoryUsers    Category = "users"
+	CategoryAPIKeys  Category = "api_keys"
+	CategoryAuth     Category = "auth"
+	CategorySystem   Category = "system"
+)
+
+type Outcome string
+
+const (
+	OutcomeSuccess Outcome = "success"
+	OutcomeFailed  Outcome = "failed"
+)
+
+type Source string
+
+const (
+	SourceWeb    Source = "web"
+	SourceAPIKey Source = "api_key"
+	SourceSystem Source = "system"
+)
+
+type ChangeKind string
+
+const (
+	ChangeText ChangeKind = "text"
+	ChangeBody ChangeKind = "body"
+)
+
+const (
+	ActionLogin                = "auth.login"
+	ActionLoginFailed          = "auth.login_failed"
+	ActionLogout               = "auth.logout"
+	ActionPasswordResetRequest = "auth.password_reset_requested"
+	ActionPasswordResetDone    = "auth.password_reset_completed"
+	ActionAPIKeyCreate         = "api_key.create"
+	ActionAPIKeyRevoke         = "api_key.revoke"
+	ActionRetentionChanged     = "system.activity_retention_changed"
+	ActionCleanup              = "system.activity_cleanup"
+	ActionArticleCreate        = "article.create"
+	ActionArticleEdit          = "article.edit"
+	ActionArticlePublish       = "article.publish"
+	ActionArticleUnpublish     = "article.unpublish"
+	ActionArticleDelete        = "article.delete"
+	ActionMediaUpload          = "media.upload"
+	ActionMediaRename          = "media.rename"
+	ActionMediaDelete          = "media.delete"
+	ActionMediaMerge           = "media.merge"
+	ActionMediaPurge           = "media.purge"
+	ActionUserRegister         = "user.register"
+	ActionUserVerify           = "user.verify"
+	ActionUserUpdateProfile    = "user.update_profile"
+	ActionInviteCreate         = "invite.create"
+	ActionInviteCancel         = "invite.cancel"
+	ActionInviteRenew          = "invite.renew"
+	ActionInviteAccept         = "invite.accept"
+	ActionMediaPurgeScheduled  = "system.media_purge"
+	ActionUpdateChecked        = "system.update_checked"
+	ActionUpdateDownloaded     = "system.update_downloaded"
+	ActionRestartRequested     = "system.restart_requested"
+)
+
+const (
+	TargetAPIKey  = "api_key"
+	TargetUser    = "user"
+	TargetArticle = "article"
+	TargetImage   = "image"
+	TargetInvite  = "invite"
+	TargetRelease = "release"
+)
+
+const (
+	SystemActorName      = "System"
+	ReasonWrongLogin     = "Wrong username or password."
+	MaxUserAgentLength   = 255
+	ParamRemoved         = "removed"
+	ParamFrom            = "from"
+	ParamTo              = "to"
+	ParamMerged          = "merged"
+	ParamArticlesUpdated = "articles_updated"
+	ParamFailedGroups    = "failed_groups"
+	ParamUpdateAvailable = "update_available"
+	ParamKind            = "kind"
+	ParamTag             = "tag"
+	FieldTitle           = "title"
+	FieldOnline          = "online"
+	FieldBody            = "body"
+	FieldFilename        = "filename"
+	FieldDisplayName     = "display_name"
+	maxNameLength        = 255
+	maxActionLength      = 64
+	maxFailureReasonSize = 255
+)
+
+func ActorTypes() []ActorType {
+	return []ActorType{ActorUser, ActorAPIKey, ActorSystem, ActorAnonymous}
+}
+
+func Categories() []Category {
+	return []Category{CategoryArticles, CategoryMedia, CategoryUsers, CategoryAPIKeys, CategoryAuth, CategorySystem}
+}
+
+func Outcomes() []Outcome {
+	return []Outcome{OutcomeSuccess, OutcomeFailed}
+}
+
+func Sources() []Source {
+	return []Source{SourceWeb, SourceAPIKey, SourceSystem}
+}
+
+func ChangeKinds() []ChangeKind {
+	return []ChangeKind{ChangeText, ChangeBody}
+}
+
+type Actor struct {
+	Type ActorType `json:"type"`
+	ID   *uint32   `json:"id"`
+	Name string    `json:"name"`
+}
+
+type Target struct {
+	Type string `json:"type"`
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+type Change struct {
+	Field  string     `json:"field"`
+	Kind   ChangeKind `json:"kind"`
+	Before *string    `json:"before,omitempty"`
+	After  *string    `json:"after,omitempty"`
+	Delta  *int       `json:"delta,omitempty"`
+}
+
+type Event struct {
+	ID            uint64         `json:"id"`
+	CreatedAt     time.Time      `json:"created_at"`
+	Action        string         `json:"action"`
+	Category      Category       `json:"category"`
+	Actor         Actor          `json:"actor"`
+	Target        Target         `json:"target"`
+	Outcome       Outcome        `json:"outcome"`
+	FailureReason *string        `json:"failure_reason"`
+	Security      bool           `json:"security"`
+	Source        Source         `json:"source"`
+	IP            *string        `json:"ip"`
+	UserAgent     *string        `json:"user_agent"`
+	Params        map[string]any `json:"params"`
+	Changes       []Change       `json:"changes"`
+}
+
+func NewEvent(action string, category Category) Event {
+	return Event{
+		Action:   action,
+		Category: category,
+		Outcome:  OutcomeSuccess,
+		Params:   map[string]any{},
+		Changes:  []Change{},
+	}
+}
+
+func SystemActor() Actor {
+	return Actor{Type: ActorSystem, Name: SystemActorName}
+}
+
+func UserActor(u user.User) Actor {
+	id := u.ID
+	name := strings.TrimSpace(u.DisplayName)
+	if name == "" {
+		name = u.Username
+	}
+	return Actor{Type: ActorUser, ID: &id, Name: name}
+}
+
+func AnonymousActor(name string) Actor {
+	return Actor{Type: ActorAnonymous, Name: name}
+}
+
+func APIKeyActor(id uint32, name string) Actor {
+	return Actor{Type: ActorAPIKey, ID: &id, Name: name}
+}
+
+func APIKeyTarget(id uint32, name string) Target {
+	return Target{Type: TargetAPIKey, ID: strconv.FormatUint(uint64(id), 10), Name: name}
+}
+
+func (e Event) Validate() error {
+	if e.Action == "" || len(e.Action) > maxActionLength {
+		return ErrInvalidEvent
+	}
+	if !slices.Contains(Categories(), e.Category) || !slices.Contains(Outcomes(), e.Outcome) || !slices.Contains(Sources(), e.Source) || !slices.Contains(ActorTypes(), e.Actor.Type) {
+		return ErrInvalidEvent
+	}
+	if e.FailureReason != nil && len(*e.FailureReason) > maxFailureReasonSize {
+		return ErrInvalidEvent
+	}
+	for _, change := range e.Changes {
+		if change.Kind != ChangeText && change.Kind != ChangeBody {
+			return ErrInvalidEvent
+		}
+	}
+	return nil
+}
+
+func (e Event) Truncated() Event {
+	e.Actor.Name = truncate(e.Actor.Name, maxNameLength)
+	e.Target.Name = truncate(e.Target.Name, maxNameLength)
+	return e
+}
+
+func truncate(value string, limit int) string {
+	runes := []rune(value)
+	return string(runes[:min(len(runes), limit)])
+}

internal/domain/audit/auditFilter.go

@@ -0,0 +1,98 @@
+package audit
+
+import (
+	"slices"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const SeriesBuckets = 7
+
+type ActorRef struct {
+	Type ActorType
+	ID   *uint32
+}
+
+const (
+	userActorPrefix   = "user:"
+	apiKeyActorPrefix = "key:"
+	systemActorRef    = "system"
+)
+
+func ParseActor(raw string) (ActorRef, error) {
+	if raw == systemActorRef {
+		return ActorRef{Type: ActorSystem}, nil
+	}
+	if rest, ok := strings.CutPrefix(raw, userActorPrefix); ok {
+		return parseActorID(ActorUser, rest)
+	}
+	if rest, ok := strings.CutPrefix(raw, apiKeyActorPrefix); ok {
+		return parseActorID(ActorAPIKey, rest)
+	}
+	return ActorRef{}, ErrInvalidFilter
+}
+
+func parseActorID(actorType ActorType, raw string) (ActorRef, error) {
+	id, err := strconv.ParseUint(raw, 10, 32)
+	if err != nil {
+		return ActorRef{}, ErrInvalidFilter
+	}
+	value := uint32(id)
+	return ActorRef{Type: actorType, ID: &value}, nil
+}
+
+func ParseCategory(raw string) (Category, error) {
+	category := Category(raw)
+	if !slices.Contains(Categories(), category) {
+		return "", ErrInvalidFilter
+	}
+	return category, nil
+}
+
+type Filter struct {
+	Query    string
+	Actor    *ActorRef
+	Category Category
+	Outcome  Outcome
+	Security bool
+	From     *time.Time
+	To       *time.Time
+	Page     int
+	Size     int
+}
+
+type Page struct {
+	Items []Event
+	Total int
+}
+
+type SummaryQuery struct {
+	From time.Time
+	To   time.Time
+}
+
+func (q SummaryQuery) Previous() SummaryQuery {
+	return SummaryQuery{From: q.From.Add(-q.To.Sub(q.From)), To: q.From}
+}
+
+type ActivePeople struct {
+	Users   int `json:"users"`
+	APIKeys int `json:"api_keys"`
+}
+
+type Series struct {
+	Total    []int `json:"total"`
+	Active   []int `json:"active"`
+	Failed   []int `json:"failed"`
+	Security []int `json:"security"`
+}
+
+type Summary struct {
+	Total         int          `json:"total"`
+	PreviousTotal int          `json:"previous_total"`
+	ActivePeople  ActivePeople `json:"active_people"`
+	Failed        int          `json:"failed"`
+	Security      int          `json:"security"`
+	Series        Series       `json:"series"`
+}

internal/domain/audit/auditRecorder.go

@@ -0,0 +1,31 @@
+package audit
+
+import "context"
+
+type Recorder interface {
+	Record(ctx context.Context, event Event)
+}
+
+type discardRecorder struct{}
+
+func (discardRecorder) Record(context.Context, Event) {}
+
+var Discard Recorder = discardRecorder{}
+
+type Origin struct {
+	Actor     Actor
+	Source    Source
+	IP        string
+	UserAgent string
+}
+
+type originContextKey struct{}
+
+func WithOrigin(ctx context.Context, origin Origin) context.Context {
+	return context.WithValue(ctx, originContextKey{}, origin)
+}
+
+func OriginFrom(ctx context.Context) (Origin, bool) {
+	origin, ok := ctx.Value(originContextKey{}).(Origin)
+	return origin, ok
+}

internal/domain/audit/auditRepositoryInterface.go

@@ -0,0 +1,16 @@
+package audit
+
+import "time"
+
+type Repository interface {
+	Append(event Event) (Event, error)
+	List(filter Filter) (Page, error)
+	Summary(query SummaryQuery) (Summary, error)
+	DeleteOlderThan(cutoff time.Time) (int, error)
+}
+
+type SettingsRepository interface {
+	Get() (Settings, error)
+	SaveRetention(days int) error
+	SaveLastCleanup(at time.Time, removed int) error
+}

internal/domain/audit/auditSettings.go

@@ -0,0 +1,57 @@
+package audit
+
+import "time"
+
+const (
+	DefaultRetentionDays = 90
+	ForeverRetentionDays = 0
+	CleanupHour          = 3
+	KeepRecentHours      = 24
+)
+
+func RetentionOptions() []int {
+	return []int{30, 90, 365, ForeverRetentionDays}
+}
+
+func ValidateRetentionDays(days int) error {
+	for _, option := range RetentionOptions() {
+		if option == days {
+			return nil
+		}
+	}
+	return ErrInvalidRetention
+}
+
+type Settings struct {
+	RetentionDays      int        `json:"activity_retention_days"`
+	LastCleanupAt      *time.Time `json:"activity_last_cleanup_at"`
+	LastCleanupRemoved int        `json:"activity_last_cleanup_removed"`
+}
+
+func DefaultSettings() Settings {
+	return Settings{RetentionDays: DefaultRetentionDays}
+}
+
+func (s Settings) CleanupDue(now time.Time) bool {
+	todayRun := time.Date(now.Year(), now.Month(), now.Day(), CleanupHour, 0, 0, 0, now.Location())
+	if now.Before(todayRun) {
+		return false
+	}
+	return s.LastCleanupAt == nil || s.LastCleanupAt.Before(todayRun)
+}
+
+func ClampCutoff(now time.Time, cutoff time.Time) time.Time {
+	newest := now.Add(-KeepRecentHours * time.Hour)
+	if cutoff.After(newest) {
+		return newest
+	}
+	return cutoff
+}
+
+func RetentionCutoff(now time.Time, retentionDays int) time.Time {
+	return ClampCutoff(now, now.Add(-time.Duration(retentionDays)*24*time.Hour))
+}
+
+type CleanupResult struct {
+	Removed int
+}

internal/domain/audit/auditTargets.go

@@ -0,0 +1,11 @@
+package audit
+
+import "strconv"
+
+func NewTarget(targetType string, id uint32, name string) Target {
+	return Target{Type: targetType, ID: strconv.FormatUint(uint64(id), 10), Name: name}
+}
+
+func ReleaseTarget(tag string) Target {
+	return Target{Type: TargetRelease, ID: tag, Name: tag}
+}

internal/domain/user/userDomain.go

@@ -15,6 +15,7 @@ var ErrInvalidPasswordResetCode = errors.New("invalid password reset code")
 var ErrPasswordResetCodeExpired = errors.New("password reset code expired")
 var ErrInvalidDisplayName = errors.New("invalid display name")
 var ErrUsernameTaken = errors.New("username taken")
+var ErrVerificationEmailNotSent = errors.New("verification email not sent")
 
 type Role string
 

internal/infrastructure/auditing/recorder.go

@@ -0,0 +1,57 @@
+package auditing
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"context"
+	"log"
+	"time"
+)
+
+type Recorder struct {
+	repository audit.Repository
+	now        func() time.Time
+	logger     *log.Logger
+}
+
+var _ audit.Recorder = &Recorder{}
+
+func NewRecorder(repository audit.Repository, now func() time.Time, logger *log.Logger) *Recorder {
+	return &Recorder{repository, now, logger}
+}
+
+func (r *Recorder) Record(ctx context.Context, event audit.Event) {
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			r.logger.Printf("audit: writing the %s event panicked: %v", event.Action, recovered)
+		}
+	}()
+
+	event = r.complete(ctx, event).Truncated()
+	if err := event.Validate(); err != nil {
+		r.logger.Printf("audit: dropped the %s event: %v", event.Action, err)
+		return
+	}
+	if _, err := r.repository.Append(event); err != nil {
+		r.logger.Printf("audit: failed to write the %s event: %v", event.Action, err)
+	}
+}
+
+func (r *Recorder) complete(ctx context.Context, event audit.Event) audit.Event {
+	origin, _ := audit.OriginFrom(ctx)
+	if event.Actor.Type == "" {
+		event.Actor = origin.Actor
+	}
+	if event.Source == "" {
+		event.Source = origin.Source
+	}
+	if event.IP == nil && origin.IP != "" {
+		ip := origin.IP
+		event.IP = &ip
+	}
+	if event.UserAgent == nil && origin.UserAgent != "" {
+		userAgent := origin.UserAgent
+		event.UserAgent = &userAgent
+	}
+	event.CreatedAt = r.now().UTC()
+	return event
+}

internal/infrastructure/persistence/database/migrate.go

@@ -7,7 +7,7 @@ import (
 )
 
 func Migrate(db *gorm.DB) error {
-	err := tableOptionsFor(db).AutoMigrate(&models.Article{}, &models.Image{}, &models.User{}, &models.Invite{}, &models.APIKey{}, &models.PurgeSettings{})
+	err := tableOptionsFor(db).AutoMigrate(&models.Article{}, &models.Image{}, &models.User{}, &models.Invite{}, &models.APIKey{}, &models.PurgeSettings{}, &models.AuditEvent{}, &models.AuditSettings{})
 	if err != nil {
 		return err
 	}

internal/infrastructure/persistence/mappers/auditMapper.go

@@ -0,0 +1,97 @@
+package mappers
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/persistence/models"
+	"encoding/json"
+)
+
+const (
+	emptyParams  = "{}"
+	emptyChanges = "[]"
+)
+
+func AuditEventToModel(e audit.Event) (models.AuditEvent, error) {
+	params, err := encodeJSON(e.Params, emptyParams)
+	if err != nil {
+		return models.AuditEvent{}, err
+	}
+	changes, err := encodeJSON(e.Changes, emptyChanges)
+	if err != nil {
+		return models.AuditEvent{}, err
+	}
+	return models.AuditEvent{
+		ID:            e.ID,
+		CreatedAt:     e.CreatedAt.UTC(),
+		Action:        e.Action,
+		Category:      string(e.Category),
+		ActorType:     string(e.Actor.Type),
+		ActorID:       e.Actor.ID,
+		ActorName:     e.Actor.Name,
+		TargetType:    e.Target.Type,
+		TargetID:      e.Target.ID,
+		TargetName:    e.Target.Name,
+		Outcome:       string(e.Outcome),
+		FailureReason: e.FailureReason,
+		Security:      e.Security,
+		Source:        string(e.Source),
+		IP:            e.IP,
+		UserAgent:     e.UserAgent,
+		Params:        params,
+		Changes:       changes,
+	}, nil
+}
+
+func AuditEventToDomain(m models.AuditEvent) (audit.Event, error) {
+	params := map[string]any{}
+	if err := json.Unmarshal([]byte(m.Params), &params); err != nil {
+		return audit.Event{}, err
+	}
+	changes := []audit.Change{}
+	if err := json.Unmarshal([]byte(m.Changes), &changes); err != nil {
+		return audit.Event{}, err
+	}
+	return audit.Event{
+		ID:            m.ID,
+		CreatedAt:     m.CreatedAt.UTC(),
+		Action:        m.Action,
+		Category:      audit.Category(m.Category),
+		Actor:         audit.Actor{Type: audit.ActorType(m.ActorType), ID: m.ActorID, Name: m.ActorName},
+		Target:        audit.Target{Type: m.TargetType, ID: m.TargetID, Name: m.TargetName},
+		Outcome:       audit.Outcome(m.Outcome),
+		FailureReason: m.FailureReason,
+		Security:      m.Security,
+		Source:        audit.Source(m.Source),
+		IP:            m.IP,
+		UserAgent:     m.UserAgent,
+		Params:        params,
+		Changes:       changes,
+	}, nil
+}
+
+func encodeJSON(value any, empty string) (string, error) {
+	encoded, err := json.Marshal(value)
+	if err != nil {
+		return "", err
+	}
+	if string(encoded) == "null" {
+		return empty, nil
+	}
+	return string(encoded), nil
+}
+
+func AuditSettingsToDomain(m models.AuditSettings) audit.Settings {
+	return audit.Settings{
+		RetentionDays:      m.RetentionDays,
+		LastCleanupAt:      m.LastCleanupAt,
+		LastCleanupRemoved: m.LastCleanupRemoved,
+	}
+}
+
+func AuditSettingsToModel(s audit.Settings) models.AuditSettings {
+	return models.AuditSettings{
+		RetentionDays:      s.RetentionDays,
+		LastCleanupAt:      s.LastCleanupAt,
+		LastCleanupRemoved: s.LastCleanupRemoved,
+	}
+}

internal/infrastructure/persistence/models/auditEventModel.go

@@ -0,0 +1,24 @@
+package models
+
+import "time"
+
+type AuditEvent struct {
+	ID            uint64    `gorm:"primaryKey;autoIncrement"`
+	CreatedAt     time.Time `gorm:"not null;index:idx_audit_events_created_at;index:idx_audit_events_actor,priority:3;index:idx_audit_events_category,priority:2"`
+	Action        string    `gorm:"not null;size:64"`
+	Category      string    `gorm:"not null;size:16;index:idx_audit_events_category,priority:1"`
+	ActorType     string    `gorm:"not null;size:16;index:idx_audit_events_actor,priority:1"`
+	ActorID       *uint32   `gorm:"index:idx_audit_events_actor,priority:2"`
+	ActorName     string    `gorm:"not null;size:255"`
+	TargetType    string    `gorm:"not null;size:32"`
+	TargetID      string    `gorm:"not null;size:64"`
+	TargetName    string    `gorm:"not null;size:255"`
+	Outcome       string    `gorm:"not null;size:16"`
+	FailureReason *string   `gorm:"size:255"`
+	Security      bool      `gorm:"not null"`
+	Source        string    `gorm:"not null;size:16"`
+	IP            *string   `gorm:"size:64"`
+	UserAgent     *string   `gorm:"size:255"`
+	Params        string    `gorm:"not null;type:text"`
+	Changes       string    `gorm:"not null;type:text"`
+}

internal/infrastructure/persistence/models/auditSettingsModel.go

@@ -0,0 +1,10 @@
+package models
+
+import "time"
+
+type AuditSettings struct {
+	ID                 uint32 `gorm:"primaryKey"`
+	RetentionDays      int    `gorm:"not null"`
+	LastCleanupAt      *time.Time
+	LastCleanupRemoved int `gorm:"not null"`
+}

internal/infrastructure/persistence/repositories/auditEventRepository.go

@@ -0,0 +1,188 @@
+package persistence
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/persistence/mappers"
+	entity "RenewCMS/internal/infrastructure/persistence/models"
+	"strings"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+const likeEscape = " ESCAPE '!'"
+
+type AuditEventRepository struct {
+	db *gorm.DB
+}
+
+var _ audit.Repository = &AuditEventRepository{}
+
+func NewAuditEventRepository(db *gorm.DB) *AuditEventRepository {
+	return &AuditEventRepository{db}
+}
+
+func (a *AuditEventRepository) Append(event audit.Event) (audit.Event, error) {
+	model, err := mappers.AuditEventToModel(event)
+	if err != nil {
+		return audit.Event{}, err
+	}
+	model.ID = 0
+	if err := a.db.Create(&model).Error; err != nil {
+		return audit.Event{}, err
+	}
+	return mappers.AuditEventToDomain(model)
+}
+
+func (a *AuditEventRepository) List(filter audit.Filter) (audit.Page, error) {
+	var total int64
+	if err := a.filtered(filter).Count(&total).Error; err != nil {
+		return audit.Page{}, err
+	}
+
+	query := a.filtered(filter).Order("created_at DESC, id DESC")
+	if filter.Size > 0 {
+		query = query.Limit(filter.Size).Offset(offsetOf(filter))
+	}
+	var found []entity.AuditEvent
+	if err := query.Find(&found).Error; err != nil {
+		return audit.Page{}, err
+	}
+
+	items := make([]audit.Event, 0, len(found))
+	for _, model := range found {
+		event, err := mappers.AuditEventToDomain(model)
+		if err != nil {
+			return audit.Page{}, err
+		}
+		items = append(items, event)
+	}
+	return audit.Page{Items: items, Total: int(total)}, nil
+}
+
+func offsetOf(filter audit.Filter) int {
+	if filter.Page < 1 {
+		return 0
+	}
+	return (filter.Page - 1) * filter.Size
+}
+
+func (a *AuditEventRepository) filtered(filter audit.Filter) *gorm.DB {
+	query := a.db.Model(&entity.AuditEvent{})
+	if filter.Actor != nil {
+		query = query.Where("actor_type = ?", string(filter.Actor.Type))
+		if filter.Actor.ID != nil {
+			query = query.Where("actor_id = ?", *filter.Actor.ID)
+		}
+	}
+	if filter.Category != "" {
+		query = query.Where("category = ?", string(filter.Category))
+	}
+	if filter.Outcome != "" {
+		query = query.Where("outcome = ?", string(filter.Outcome))
+	}
+	if filter.Security {
+		query = query.Where("security = ?", true)
+	}
+	if filter.From != nil {
+		query = query.Where("created_at >= ?", filter.From.UTC())
+	}
+	if filter.To != nil {
+		query = query.Where("created_at < ?", filter.To.UTC())
+	}
+	if filter.Query != "" {
+		pattern := containsPattern(strings.ToLower(filter.Query))
+		query = query.Where("(LOWER(actor_name) LIKE ?"+likeEscape+" OR LOWER(target_name) LIKE ?"+likeEscape+")", pattern, pattern)
+	}
+	return query
+}
+
+func (a *AuditEventRepository) Summary(query audit.SummaryQuery) (audit.Summary, error) {
+	var summary audit.Summary
+	totals, err := a.countsBetween(query.From, query.To)
+	if err != nil {
+		return audit.Summary{}, err
+	}
+	summary.Total, summary.Failed, summary.Security = totals.Total, totals.Failed, totals.Security
+
+	previous := query.Previous()
+	previousTotals, err := a.countsBetween(previous.From, previous.To)
+	if err != nil {
+		return audit.Summary{}, err
+	}
+	summary.PreviousTotal = previousTotals.Total
+
+	if summary.ActivePeople.Users, err = a.distinctActors(audit.ActorUser, query.From, query.To); err != nil {
+		return audit.Summary{}, err
+	}
+	if summary.ActivePeople.APIKeys, err = a.distinctActors(audit.ActorAPIKey, query.From, query.To); err != nil {
+		return audit.Summary{}, err
+	}
+	summary.Series, err = a.series(query)
+	return summary, err
+}
+
+type countsRow struct {
+	Total    int
+	Failed   int
+	Security int
+}
+
+func (a *AuditEventRepository) countsBetween(from time.Time, to time.Time) (countsRow, error) {
+	var row countsRow
+	err := a.db.Model(&entity.AuditEvent{}).
+		Select("COUNT(*) AS total, "+
+			"COALESCE(SUM(CASE WHEN outcome = ? THEN 1 ELSE 0 END), 0) AS failed, "+
+			"COALESCE(SUM(CASE WHEN security = ? THEN 1 ELSE 0 END), 0) AS security", string(audit.OutcomeFailed), true).
+		Where("created_at >= ? AND created_at < ?", from.UTC(), to.UTC()).
+		Scan(&row).Error
+	return row, err
+}
+
+func (a *AuditEventRepository) distinctActors(actorType audit.ActorType, from time.Time, to time.Time) (int, error) {
+	var count int64
+	err := a.db.Model(&entity.AuditEvent{}).
+		Where("actor_type = ? AND created_at >= ? AND created_at < ?", string(actorType), from.UTC(), to.UTC()).
+		Distinct("actor_id").
+		Count(&count).Error
+	return int(count), err
+}
+
+func (a *AuditEventRepository) series(query audit.SummaryQuery) (audit.Series, error) {
+	series := audit.Series{
+		Total:    make([]int, audit.SeriesBuckets),
+		Active:   make([]int, audit.SeriesBuckets),
+		Failed:   make([]int, audit.SeriesBuckets),
+		Security: make([]int, audit.SeriesBuckets),
+	}
+	width := query.To.Sub(query.From) / audit.SeriesBuckets
+	if width <= 0 {
+		return series, nil
+	}
+	for i := 0; i < audit.SeriesBuckets; i++ {
+		from := query.From.Add(time.Duration(i) * width)
+		to := from.Add(width)
+		if i == audit.SeriesBuckets-1 {
+			to = query.To
+		}
+		counts, err := a.countsBetween(from, to)
+		if err != nil {
+			return audit.Series{}, err
+		}
+		users, err := a.distinctActors(audit.ActorUser, from, to)
+		if err != nil {
+			return audit.Series{}, err
+		}
+		keys, err := a.distinctActors(audit.ActorAPIKey, from, to)
+		if err != nil {
+			return audit.Series{}, err
+		}
+		series.Total[i], series.Failed[i], series.Security[i], series.Active[i] = counts.Total, counts.Failed, counts.Security, users+keys
+	}
+	return series, nil
+}
+
+func (a *AuditEventRepository) DeleteOlderThan(cutoff time.Time) (int, error) {
+	result := a.db.Where("created_at < ?", cutoff.UTC()).Delete(&entity.AuditEvent{})
+	return int(result.RowsAffected), result.Error
+}

internal/infrastructure/persistence/repositories/auditSettingsRepository.go

@@ -0,0 +1,61 @@
+package persistence
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/persistence/mappers"
+	entity "RenewCMS/internal/infrastructure/persistence/models"
+	"errors"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+const auditSettingsRowID uint32 = 1
+
+type AuditSettingsRepository struct {
+	db *gorm.DB
+}
+
+var _ audit.SettingsRepository = &AuditSettingsRepository{}
+
+func NewAuditSettingsRepository(db *gorm.DB) *AuditSettingsRepository {
+	return &AuditSettingsRepository{db}
+}
+
+func (a *AuditSettingsRepository) Get() (audit.Settings, error) {
+	var model entity.AuditSettings
+	err := a.db.First(&model, auditSettingsRowID).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return audit.DefaultSettings(), nil
+	}
+	if err != nil {
+		return audit.Settings{}, err
+	}
+	return mappers.AuditSettingsToDomain(model), nil
+}
+
+func (a *AuditSettingsRepository) SaveRetention(days int) error {
+	return a.update(map[string]any{"retention_days": days}, func(settings *audit.Settings) {
+		settings.RetentionDays = days
+	})
+}
+
+func (a *AuditSettingsRepository) SaveLastCleanup(at time.Time, removed int) error {
+	utc := at.UTC()
+	return a.update(map[string]any{"last_cleanup_at": utc, "last_cleanup_removed": removed}, func(settings *audit.Settings) {
+		settings.LastCleanupAt = &utc
+		settings.LastCleanupRemoved = removed
+	})
+}
+
+func (a *AuditSettingsRepository) update(columns map[string]any, apply func(*audit.Settings)) error {
+	result := a.db.Model(&entity.AuditSettings{}).Where("id = ?", auditSettingsRowID).Updates(columns)
+	if result.Error != nil || result.RowsAffected > 0 {
+		return result.Error
+	}
+	settings := audit.DefaultSettings()
+	apply(&settings)
+	model := mappers.AuditSettingsToModel(settings)
+	model.ID = auditSettingsRowID
+	return a.db.Create(&model).Error
+}

internal/infrastructure/scheduler/runner.go

@@ -1,9 +1,11 @@
 package scheduler
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/purge"
 	"context"
 	"errors"
+	"fmt"
 	"log"
 	"time"
 )
@@ -17,8 +19,39 @@ type Job interface {
 	Tick(now time.Time) (purge.RunResult, bool, error)
 }
 
-type Runner struct {
+type CleanupJob interface {
+	Tick(now time.Time) (audit.CleanupResult, bool, error)
+}
+
+type task interface {
+	tick(now time.Time) (summary string, ran bool, err error)
+}
+
+type purgeTask struct {
 	job Job
+}
+
+func (p purgeTask) tick(now time.Time) (string, bool, error) {
+	result, ran, err := p.job.Tick(now)
+	if errors.Is(err, purge.ErrPurgeBusy) {
+		return "", false, nil
+	}
+	summary := fmt.Sprintf("groups_purged=%d merged=%d articles_updated=%d failed_groups=%d", result.GroupsPurged, result.Merged, result.ArticlesUpdated, result.FailedGroups)
+	return summary, ran, err
+}
+
+type cleanupTask struct {
+	job CleanupJob
+}
+
+func (c cleanupTask) tick(now time.Time) (string, bool, error) {
+	result, ran, err := c.job.Tick(now)
+	return fmt.Sprintf("removed=%d", result.Removed), ran, err
+}
+
+type Runner struct {
+	label   string
+	task    task
 	now     func() time.Time
 	ticks   <-chan time.Time
 	startup <-chan time.Time
@@ -26,14 +59,39 @@ type Runner struct {
 	release func()
 }
 
+const (
+	purgeLabel   = "automatic purge"
+	cleanupLabel = "activity cleanup"
+)
+
+func newRunner(label string, task task, now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time, logger *log.Logger) *Runner {
+	return &Runner{label: label, task: task, now: now, ticks: ticks, startup: startup, logger: logger, release: func() {}}
+}
+
 func NewRunner(job Job, now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time, logger *log.Logger) *Runner {
-	return &Runner{job: job, now: now, ticks: ticks, startup: startup, logger: logger, release: func() {}}
+	return newRunner(purgeLabel, purgeTask{job}, now, ticks, startup, logger)
+}
+
+func NewCleanupRunner(job CleanupJob, now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time, logger *log.Logger) *Runner {
+	return newRunner(cleanupLabel, cleanupTask{job}, now, ticks, startup, logger)
 }
 
 func NewSystemRunner(job Job, logger *log.Logger) *Runner {
+	return withSystemTimers(func(now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time) *Runner {
+		return NewRunner(job, now, ticks, startup, logger)
+	})
+}
+
+func NewSystemCleanupRunner(job CleanupJob, logger *log.Logger) *Runner {
+	return withSystemTimers(func(now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time) *Runner {
+		return NewCleanupRunner(job, now, ticks, startup, logger)
+	})
+}
+
+func withSystemTimers(build func(now func() time.Time, ticks <-chan time.Time, startup <-chan time.Time) *Runner) *Runner {
 	ticker := time.NewTicker(TickInterval)
 	startup := time.NewTimer(StartupDelay)
-	runner := NewRunner(job, time.Now, ticker.C, startup.C, logger)
+	runner := build(time.Now, ticker.C, startup.C)
 	runner.release = func() {
 		ticker.Stop()
 		startup.Stop()
@@ -61,15 +119,12 @@ func (r *Runner) tick(ctx context.Context) {
 	if ctx.Err() != nil {
 		return
 	}
-	result, ran, err := r.job.Tick(r.now())
+	summary, ran, err := r.task.tick(r.now())
-	if errors.Is(err, purge.ErrPurgeBusy) {
-		return
-	}
 	if err != nil {
-		r.logger.Printf("scheduler: automatic purge failed: %v", err)
+		r.logger.Printf("scheduler: %s failed: %v", r.label, err)
 		return
 	}
 	if ran {
-		r.logger.Printf("scheduler: automatic purge completed: groups_purged=%d merged=%d articles_updated=%d failed_groups=%d", result.GroupsPurged, result.Merged, result.ArticlesUpdated, result.FailedGroups)
+		r.logger.Printf("scheduler: %s completed: %s", r.label, summary)
 	}
 }

internal/infrastructure/useCases/AcceptInvite.go

@@ -1,9 +1,11 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/invite"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"errors"
 	"strings"
 	"time"
@@ -13,6 +15,7 @@ type AcceptInviteUseCase struct {
 	userRepository   user.Repository
 	inviteRepository invite.Repository
 	hasher           hash.Hasher
+	recorder         audit.Recorder
 }
 
 type AcceptInviteCommand struct {
@@ -21,18 +24,37 @@ type AcceptInviteCommand struct {
 	Password string
 }
 
-func NewAcceptInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher) *AcceptInviteUseCase {
+func NewAcceptInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, recorder audit.Recorder) *AcceptInviteUseCase {
-	return &AcceptInviteUseCase{userRepository, inviteRepository, hasher}
+	return &AcceptInviteUseCase{userRepository, inviteRepository, hasher, recorder}
 }
 
-func (a *AcceptInviteUseCase) AcceptInvite(command AcceptInviteCommand) (user.User, error) {
+func (a *AcceptInviteUseCase) AcceptInvite(ctx context.Context, command AcceptInviteCommand) (user.User, error) {
+	event := audit.NewEvent(audit.ActionInviteAccept, audit.CategoryUsers)
 	now := time.Now()
 
 	pending, err := findUsableInvite(a.inviteRepository, a.hasher, command.Code, now)
 	if err != nil {
+		a.recordRefusal(ctx, event, command, err)
 		return user.User{}, err
 	}
+	event.Target = inviteTarget(pending)
 
+	created, err := a.accept(command, pending, now)
+	if err != nil {
+		a.recordRefusal(ctx, event, command, err)
+		return user.User{}, err
+	}
+	event.Actor = audit.UserActor(created)
+	a.recorder.Record(ctx, event)
+	return created, nil
+}
+
+func (a *AcceptInviteUseCase) recordRefusal(ctx context.Context, event audit.Event, command AcceptInviteCommand, cause error) {
+	event.Actor = audit.AnonymousActor(command.Username)
+	recordFailure(ctx, a.recorder, event, cause)
+}
+
+func (a *AcceptInviteUseCase) accept(command AcceptInviteCommand, pending invite.Invite, now time.Time) (user.User, error) {
 	if a.emailHasAccount(pending.Email) {
 		if _, err := findUsableInvite(a.inviteRepository, a.hasher, command.Code, now); err != nil {
 			return user.User{}, err

internal/infrastructure/useCases/ActivityRetention.go

@@ -0,0 +1,50 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"context"
+)
+
+type GetActivityRetentionUseCase struct {
+	settings audit.SettingsRepository
+}
+
+func NewGetActivityRetentionUseCase(settings audit.SettingsRepository) *GetActivityRetentionUseCase {
+	return &GetActivityRetentionUseCase{settings}
+}
+
+func (g *GetActivityRetentionUseCase) GetActivityRetention() (audit.Settings, error) {
+	return g.settings.Get()
+}
+
+type UpdateActivityRetentionUseCase struct {
+	settings audit.SettingsRepository
+	recorder audit.Recorder
+}
+
+func NewUpdateActivityRetentionUseCase(settings audit.SettingsRepository, recorder audit.Recorder) *UpdateActivityRetentionUseCase {
+	return &UpdateActivityRetentionUseCase{settings, recorder}
+}
+
+func (u *UpdateActivityRetentionUseCase) UpdateActivityRetention(ctx context.Context, days int) (audit.Settings, error) {
+	if err := audit.ValidateRetentionDays(days); err != nil {
+		return audit.Settings{}, err
+	}
+	current, err := u.settings.Get()
+	if err != nil {
+		return audit.Settings{}, err
+	}
+	if current.RetentionDays == days {
+		return current, nil
+	}
+	if err := u.settings.SaveRetention(days); err != nil {
+		return audit.Settings{}, err
+	}
+
+	event := audit.NewEvent(audit.ActionRetentionChanged, audit.CategorySystem)
+	event.Params = map[string]any{audit.ParamFrom: current.RetentionDays, audit.ParamTo: days}
+	u.recorder.Record(ctx, event)
+
+	current.RetentionDays = days
+	return current, nil
+}

internal/infrastructure/useCases/AuthenticateUser.go

@@ -1,20 +1,37 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/user"
+	"context"
+	"errors"
 )
 
 type AuthenticateUserUseCase struct {
 	userRepository user.Repository
 	hasher         hash.Hasher
+	recorder       audit.Recorder
 }
 
-func NewAuthenticateUserUseCase(userRepository user.Repository, hasher hash.Hasher) *AuthenticateUserUseCase {
+func NewAuthenticateUserUseCase(userRepository user.Repository, hasher hash.Hasher, recorder audit.Recorder) *AuthenticateUserUseCase {
-	return &AuthenticateUserUseCase{userRepository, hasher}
+	return &AuthenticateUserUseCase{userRepository, hasher, recorder}
 }
 
-func (a *AuthenticateUserUseCase) Authenticate(username string, password string) (user.User, error) {
+func (a *AuthenticateUserUseCase) Authenticate(ctx context.Context, username string, password string) (user.User, error) {
+	dbUser, err := a.verifyCredentials(username, password)
+	if err != nil {
+		a.recordRejectedLogin(ctx, username, err)
+		return user.User{}, err
+	}
+
+	event := audit.NewEvent(audit.ActionLogin, audit.CategoryAuth)
+	event.Actor = audit.UserActor(dbUser)
+	a.recorder.Record(ctx, event)
+	return dbUser, nil
+}
+
+func (a *AuthenticateUserUseCase) verifyCredentials(username string, password string) (user.User, error) {
 	dbUser, err := a.userRepository.GetByUsername(username)
 	if err != nil {
 		return user.User{}, err
@@ -26,3 +43,24 @@ func (a *AuthenticateUserUseCase) Authenticate(username string, password string)
 
 	return dbUser, nil
 }
+
+func (a *AuthenticateUserUseCase) recordRejectedLogin(ctx context.Context, username string, cause error) {
+	if !errors.Is(cause, user.ErrUserNotFound) && !errors.Is(cause, user.ErrInvalidCredentials) {
+		return
+	}
+	reason := audit.ReasonWrongLogin
+	event := audit.NewEvent(audit.ActionLoginFailed, audit.CategoryAuth)
+	event.Actor = audit.AnonymousActor(username)
+	event.Outcome = audit.OutcomeFailed
+	event.FailureReason = &reason
+	event.Security = true
+	a.recorder.Record(ctx, event)
+}
+
+func (a *AuthenticateUserUseCase) Logout(ctx context.Context) {
+	origin, ok := audit.OriginFrom(ctx)
+	if !ok || origin.Actor.Type != audit.ActorUser {
+		return
+	}
+	a.recorder.Record(ctx, audit.NewEvent(audit.ActionLogout, audit.CategoryAuth))
+}

internal/infrastructure/useCases/CancelInvite.go

@@ -1,18 +1,36 @@
 package useCases
 
-import "RenewCMS/internal/domain/invite"
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/invite"
+	"context"
+)
 
 type CancelInviteUseCase struct {
 	inviteRepository invite.Repository
+	recorder         audit.Recorder
 }
 
-func NewCancelInviteUseCase(inviteRepository invite.Repository) *CancelInviteUseCase {
+func NewCancelInviteUseCase(inviteRepository invite.Repository, recorder audit.Recorder) *CancelInviteUseCase {
-	return &CancelInviteUseCase{inviteRepository}
+	return &CancelInviteUseCase{inviteRepository, recorder}
 }
 
-func (c *CancelInviteUseCase) CancelInvite(id uint32) error {
+func (c *CancelInviteUseCase) CancelInvite(ctx context.Context, id uint32) error {
-	if _, err := findManageableInvite(c.inviteRepository, id); err != nil {
+	event := audit.NewEvent(audit.ActionInviteCancel, audit.CategoryUsers)
+	pending, err := findManageableInvite(c.inviteRepository, id)
+	if err != nil {
+		recordFailure(ctx, c.recorder, event, err)
 		return err
 	}
-	return c.inviteRepository.Delete(id)
+	event.Target = inviteTarget(pending)
+	if err := c.inviteRepository.Delete(id); err != nil {
+		recordFailure(ctx, c.recorder, event, err)
+		return err
+	}
+	c.recorder.Record(ctx, event)
+	return nil
+}
+
+func inviteTarget(i invite.Invite) audit.Target {
+	return audit.NewTarget(audit.TargetInvite, i.ID, i.Email)
 }

internal/infrastructure/useCases/CheckForUpdate.go

@@ -1,7 +1,9 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/update"
+	"context"
 	"time"
 )
 
@@ -10,13 +12,27 @@ type CheckForUpdateUseCase struct {
 	store          update.StatusStore
 	currentVersion string
 	now            func() time.Time
+	recorder       audit.Recorder
 }
 
-func NewCheckForUpdateUseCase(feed update.ReleaseFeed, store update.StatusStore, currentVersion string, now func() time.Time) *CheckForUpdateUseCase {
+func NewCheckForUpdateUseCase(feed update.ReleaseFeed, store update.StatusStore, currentVersion string, now func() time.Time, recorder audit.Recorder) *CheckForUpdateUseCase {
-	return &CheckForUpdateUseCase{feed: feed, store: store, currentVersion: currentVersion, now: now}
+	return &CheckForUpdateUseCase{feed: feed, store: store, currentVersion: currentVersion, now: now, recorder: recorder}
 }
 
-func (c *CheckForUpdateUseCase) Check() (update.UpdateStatus, error) {
+func (c *CheckForUpdateUseCase) Check(ctx context.Context) (update.UpdateStatus, error) {
+	event := audit.NewEvent(audit.ActionUpdateChecked, audit.CategorySystem)
+	status, err := c.check()
+	if err != nil {
+		recordFailure(ctx, c.recorder, event, err)
+		return update.UpdateStatus{}, err
+	}
+	event.Target = audit.ReleaseTarget(status.Latest)
+	event.Params = map[string]any{audit.ParamUpdateAvailable: status.Available}
+	c.recorder.Record(ctx, event)
+	return status, nil
+}
+
+func (c *CheckForUpdateUseCase) check() (update.UpdateStatus, error) {
 	release, err := c.feed.Latest()
 	if err != nil {
 		return update.UpdateStatus{}, err

internal/infrastructure/useCases/CleanupActivity.go

@@ -0,0 +1,47 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"context"
+	"time"
+)
+
+type CleanupActivityUseCase struct {
+	events   audit.Repository
+	settings audit.SettingsRepository
+	recorder audit.Recorder
+}
+
+func NewCleanupActivityUseCase(events audit.Repository, settings audit.SettingsRepository, recorder audit.Recorder) *CleanupActivityUseCase {
+	return &CleanupActivityUseCase{events, settings, recorder}
+}
+
+func (c *CleanupActivityUseCase) Tick(now time.Time) (audit.CleanupResult, bool, error) {
+	settings, err := c.settings.Get()
+	if err != nil {
+		return audit.CleanupResult{}, false, err
+	}
+	if settings.RetentionDays == audit.ForeverRetentionDays || !settings.CleanupDue(now) {
+		return audit.CleanupResult{}, false, nil
+	}
+
+	removed, err := c.events.DeleteOlderThan(audit.RetentionCutoff(now, settings.RetentionDays))
+	if err != nil {
+		return audit.CleanupResult{}, false, err
+	}
+	if err := c.settings.SaveLastCleanup(now, removed); err != nil {
+		return audit.CleanupResult{}, false, err
+	}
+	if removed > 0 {
+		c.recordCleanup(removed)
+	}
+	return audit.CleanupResult{Removed: removed}, true, nil
+}
+
+func (c *CleanupActivityUseCase) recordCleanup(removed int) {
+	event := audit.NewEvent(audit.ActionCleanup, audit.CategorySystem)
+	event.Actor = audit.SystemActor()
+	event.Source = audit.SourceSystem
+	event.Params = map[string]any{audit.ParamRemoved: removed}
+	c.recorder.Record(context.Background(), event)
+}

internal/infrastructure/useCases/CreateAPIKey.go

@@ -2,6 +2,8 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/apikey"
+	"RenewCMS/internal/domain/audit"
+	"context"
 	"time"
 )
 
@@ -9,6 +11,7 @@ type CreateAPIKeyUseCase struct {
 	apiKeyRepository apikey.Repository
 	keyGenerator     apikey.KeyGenerator
 	now              func() time.Time
+	recorder         audit.Recorder
 }
 
 type CreateAPIKeyCommand struct {
@@ -22,11 +25,11 @@ type CreatedAPIKey struct {
 	RawKey string
 }
 
-func NewCreateAPIKeyUseCase(apiKeyRepository apikey.Repository, keyGenerator apikey.KeyGenerator, now func() time.Time) *CreateAPIKeyUseCase {
+func NewCreateAPIKeyUseCase(apiKeyRepository apikey.Repository, keyGenerator apikey.KeyGenerator, now func() time.Time, recorder audit.Recorder) *CreateAPIKeyUseCase {
-	return &CreateAPIKeyUseCase{apiKeyRepository, keyGenerator, now}
+	return &CreateAPIKeyUseCase{apiKeyRepository, keyGenerator, now, recorder}
 }
 
-func (c *CreateAPIKeyUseCase) CreateAPIKey(command CreateAPIKeyCommand) (CreatedAPIKey, error) {
+func (c *CreateAPIKeyUseCase) CreateAPIKey(ctx context.Context, command CreateAPIKeyCommand) (CreatedAPIKey, error) {
 	now := c.now()
 	if command.ExpiresAt != nil && !command.ExpiresAt.After(now) {
 		return CreatedAPIKey{}, apikey.ErrExpiryNotInFuture
@@ -45,5 +48,9 @@ func (c *CreateAPIKeyUseCase) CreateAPIKey(command CreateAPIKeyCommand) (Created
 		return CreatedAPIKey{}, err
 	}
 
+	event := audit.NewEvent(audit.ActionAPIKeyCreate, audit.CategoryAPIKeys)
+	event.Target = audit.APIKeyTarget(stored.ID, stored.Name)
+	c.recorder.Record(ctx, event)
+
 	return CreatedAPIKey{Key: stored, RawKey: rawKey}, nil
 }

internal/infrastructure/useCases/CreateArticle.go

@@ -2,11 +2,14 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"context"
 )
 
 type CreateArticleUseCase struct {
 	articleRepository article.Repository
 	bodyRenderer      article.BodyRenderer
+	recorder          audit.Recorder
 }
 
 type CreateArticleCommand struct {
@@ -15,12 +18,14 @@ type CreateArticleCommand struct {
 	Format article.BodyFormat
 }
 
-func NewCreateArticleUseCase(articleRepository article.Repository, bodyRenderer article.BodyRenderer) *CreateArticleUseCase {
+func NewCreateArticleUseCase(articleRepository article.Repository, bodyRenderer article.BodyRenderer, recorder audit.Recorder) *CreateArticleUseCase {
-	return &CreateArticleUseCase{articleRepository, bodyRenderer}
+	return &CreateArticleUseCase{articleRepository, bodyRenderer, recorder}
 }
 
-func (g *CreateArticleUseCase) CreateArticle(createArticle CreateArticleCommand) (article.Article, error) {
+func (g *CreateArticleUseCase) CreateArticle(ctx context.Context, createArticle CreateArticleCommand) (article.Article, error) {
+	event := audit.NewEvent(audit.ActionArticleCreate, audit.CategoryArticles)
 	if err := article.ValidateTitle(createArticle.Title); err != nil {
+		recordFailure(ctx, g.recorder, event, err)
 		return article.Article{}, err
 	}
 
@@ -30,7 +35,15 @@ func (g *CreateArticleUseCase) CreateArticle(createArticle CreateArticleCommand)
 		IsOnline: false,
 	})
 	if err != nil {
+		recordFailure(ctx, g.recorder, event, err)
 		return article.Article{}, err
 	}
+
+	event.Target = articleTarget(created)
+	g.recorder.Record(ctx, event)
 	return renderArticle(g.bodyRenderer, created, createArticle.Format)
 }
+
+func articleTarget(a article.Article) audit.Target {
+	return audit.NewTarget(audit.TargetArticle, a.ID, a.Title)
+}

internal/infrastructure/useCases/CreateImage.go

@@ -1,13 +1,16 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/image"
 	"bytes"
+	"context"
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/xml"
 	stdimage "image"
 	"io"
+	"strings"
 
 	_ "golang.org/x/image/webp"
 	_ "image/jpeg"
@@ -25,13 +28,38 @@ var rasterFormats = map[string]string{
 type CreateImageUseCase struct {
 	imageRepository image.Repository
 	storage         image.Storage
+	recorder        audit.Recorder
 }
 
-func NewCreateImageUseCase(imageRepository image.Repository, storage image.Storage) *CreateImageUseCase {
+func NewCreateImageUseCase(imageRepository image.Repository, storage image.Storage, recorder audit.Recorder) *CreateImageUseCase {
-	return &CreateImageUseCase{imageRepository, storage}
+	return &CreateImageUseCase{imageRepository, storage, recorder}
 }
 
-func (g *CreateImageUseCase) CreateImage(input image.ImageInput) (image.Image, error) {
+func (g *CreateImageUseCase) CreateImage(ctx context.Context, input image.ImageInput) (image.Image, error) {
+	created, err := g.create(input)
+	event := audit.NewEvent(audit.ActionMediaUpload, audit.CategoryMedia)
+	if err != nil {
+		event.Target = attemptedUploadTarget(input)
+		recordFailure(ctx, g.recorder, event, err)
+		return image.Image{}, err
+	}
+	event.Target = imageTarget(created)
+	g.recorder.Record(ctx, event)
+	return created, nil
+}
+
+func imageTarget(img image.Image) audit.Target {
+	return audit.NewTarget(audit.TargetImage, img.ID, img.Filename)
+}
+
+func attemptedUploadTarget(input image.ImageInput) audit.Target {
+	if strings.TrimSpace(input.Filename) == "" {
+		return audit.Target{}
+	}
+	return audit.Target{Type: audit.TargetImage, Name: image.NormalizeUploadFilename(input.Filename, input.ContentType)}
+}
+
+func (g *CreateImageUseCase) create(input image.ImageInput) (image.Image, error) {
 	if !image.IsAllowedContentType(input.ContentType) {
 		return image.Image{}, image.ErrImageTypeNotAllowed
 	}

internal/infrastructure/useCases/CreateInvite.go

@@ -1,10 +1,12 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/invite"
 	"RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"errors"
 	"strings"
 	"time"
@@ -15,6 +17,7 @@ type CreateInviteUseCase struct {
 	inviteRepository invite.Repository
 	hasher           hash.Hasher
 	mailer           inviteMailer
+	recorder         audit.Recorder
 }
 
 type CreateInviteCommand struct {
@@ -22,11 +25,23 @@ type CreateInviteCommand struct {
 	InvitedBy uint32
 }
 
-func NewCreateInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *CreateInviteUseCase {
+func NewCreateInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string, recorder audit.Recorder) *CreateInviteUseCase {
-	return &CreateInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}}
+	return &CreateInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}, recorder}
 }
 
-func (g *CreateInviteUseCase) CreateInvite(command CreateInviteCommand) (invite.Invite, error) {
+func (g *CreateInviteUseCase) CreateInvite(ctx context.Context, command CreateInviteCommand) (invite.Invite, error) {
+	event := audit.NewEvent(audit.ActionInviteCreate, audit.CategoryUsers)
+	created, err := g.create(command)
+	if err != nil {
+		recordFailure(ctx, g.recorder, event, err)
+		return invite.Invite{}, err
+	}
+	event.Target = inviteTarget(created)
+	g.recorder.Record(ctx, event)
+	return created, nil
+}
+
+func (g *CreateInviteUseCase) create(command CreateInviteCommand) (invite.Invite, error) {
 	email := strings.ToLower(command.Email)
 	now := time.Now()
 

internal/infrastructure/useCases/CreateUser.go

@@ -1,9 +1,11 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"errors"
 	"fmt"
 	"time"
@@ -16,6 +18,7 @@ type CreateUserUseCase struct {
 	hasher         hash.Hasher
 	mailRepository mail.Repository
 	publicURL      string
+	recorder       audit.Recorder
 }
 
 type CreateUserCommand struct {
@@ -29,11 +32,25 @@ type MailValidationData struct {
 	VerificationCode string
 }
 
-func NewCreateUserUseCase(userRepository user.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *CreateUserUseCase {
+func NewCreateUserUseCase(userRepository user.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string, recorder audit.Recorder) *CreateUserUseCase {
-	return &CreateUserUseCase{userRepository, hasher, mailRepository, publicURL}
+	return &CreateUserUseCase{userRepository, hasher, mailRepository, publicURL, recorder}
 }
 
-func (g *CreateUserUseCase) CreateUser(createUser CreateUserCommand) (user.User, error) {
+func (g *CreateUserUseCase) CreateUser(ctx context.Context, createUser CreateUserCommand) (user.User, error) {
+	event := audit.NewEvent(audit.ActionUserRegister, audit.CategoryUsers)
+	created, err := g.create(createUser)
+	if err != nil {
+		event.Actor = audit.AnonymousActor(createUser.Username)
+		recordFailure(ctx, g.recorder, event, err)
+		return user.User{}, err
+	}
+	event.Actor = audit.UserActor(created)
+	event.Target = audit.NewTarget(audit.TargetUser, created.ID, created.Username)
+	g.recorder.Record(ctx, event)
+	return created, nil
+}
+
+func (g *CreateUserUseCase) create(createUser CreateUserCommand) (user.User, error) {
 	if g.registrationClosed() {
 		return user.User{}, user.ErrRegistrationClosed
 	}
@@ -70,7 +87,7 @@ func (g *CreateUserUseCase) CreateUser(createUser CreateUserCommand) (user.User,
 		Host:             g.publicURL,
 		VerificationCode: rawUuid,
 	}); err != nil {
-		sendErr := fmt.Errorf("failed to send verification email: %w", err)
+		sendErr := fmt.Errorf("%w: %w", user.ErrVerificationEmailNotSent, err)
 		if deleteErr := g.userRepository.Delete(createdUser.ID); deleteErr != nil {
 			return user.User{}, errors.Join(sendErr, deleteErr)
 		}

internal/infrastructure/useCases/DeleteArticle.go

@@ -1,15 +1,32 @@
 package useCases
 
-import "RenewCMS/internal/domain/article"
+import (
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"context"
+)
 
 type DeleteArticleUseCase struct {
 	articleRepository article.Repository
+	recorder          audit.Recorder
 }
 
-func NewDeleteArticleUseCase(articleRepository article.Repository) *DeleteArticleUseCase {
+func NewDeleteArticleUseCase(articleRepository article.Repository, recorder audit.Recorder) *DeleteArticleUseCase {
-	return &DeleteArticleUseCase{articleRepository}
+	return &DeleteArticleUseCase{articleRepository, recorder}
 }
 
-func (g *DeleteArticleUseCase) DeleteArticle(id uint32) error {
+func (g *DeleteArticleUseCase) DeleteArticle(ctx context.Context, id uint32) error {
-	return g.articleRepository.Delete(id)
+	target, err := g.articleRepository.Get(id)
+	if err != nil {
+		return err
+	}
+
+	event := audit.NewEvent(audit.ActionArticleDelete, audit.CategoryArticles)
+	event.Target = articleTarget(target)
+	if err := g.articleRepository.Delete(id); err != nil {
+		recordFailure(ctx, g.recorder, event, err)
+		return err
+	}
+	g.recorder.Record(ctx, event)
+	return nil
 }

internal/infrastructure/useCases/DeleteMedia.go

@@ -1,20 +1,33 @@
 package useCases
 
-import "RenewCMS/internal/domain/image"
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"context"
+)
 
 type DeleteMediaUseCase struct {
 	imageRepository image.Repository
 	remover         mediaRemover
+	recorder        audit.Recorder
 }
 
-func NewDeleteMediaUseCase(imageRepository image.Repository, storage image.Storage) *DeleteMediaUseCase {
+func NewDeleteMediaUseCase(imageRepository image.Repository, storage image.Storage, recorder audit.Recorder) *DeleteMediaUseCase {
-	return &DeleteMediaUseCase{imageRepository, mediaRemover{imageRepository, storage}}
+	return &DeleteMediaUseCase{imageRepository, mediaRemover{imageRepository, storage}, recorder}
 }
 
-func (u *DeleteMediaUseCase) Delete(id uint32) error {
+func (u *DeleteMediaUseCase) Delete(ctx context.Context, id uint32) error {
 	img, err := u.imageRepository.Get(id)
 	if err != nil {
 		return err
 	}
-	return u.remover.remove(img)
+
+	event := audit.NewEvent(audit.ActionMediaDelete, audit.CategoryMedia)
+	event.Target = imageTarget(img)
+	if err := u.remover.remove(img); err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return err
+	}
+	u.recorder.Record(ctx, event)
+	return nil
 }

internal/infrastructure/useCases/ExportActivity.go

@@ -0,0 +1,88 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"encoding/csv"
+	"io"
+	"strings"
+	"time"
+)
+
+const exportBatchSize = 500
+
+const formulaGuard = "'"
+const formulaStarts = "=+-@"
+
+var exportHeader = []string{"when", "actor", "action", "target", "outcome", "source", "ip"}
+
+type ExportActivityUseCase struct {
+	events audit.Repository
+	now    func() time.Time
+}
+
+type ActivityExport struct {
+	events audit.Repository
+	filter audit.Filter
+}
+
+func NewExportActivityUseCase(events audit.Repository, now func() time.Time) *ExportActivityUseCase {
+	return &ExportActivityUseCase{events, now}
+}
+
+func (e *ExportActivityUseCase) Prepare(query ActivityQuery) (*ActivityExport, error) {
+	filter, err := buildActivityFilter(query, e.now())
+	if err != nil {
+		return nil, err
+	}
+	return &ActivityExport{events: e.events, filter: filter}, nil
+}
+
+func (a *ActivityExport) WriteCSV(w io.Writer) error {
+	writer := csv.NewWriter(w)
+	if err := writer.Write(exportHeader); err != nil {
+		return err
+	}
+	for page := 1; ; page++ {
+		filter := a.filter
+		filter.Page, filter.Size = page, exportBatchSize
+		found, err := a.events.List(filter)
+		if err != nil {
+			return err
+		}
+		for _, event := range found.Items {
+			if err := writer.Write(exportRow(event)); err != nil {
+				return err
+			}
+		}
+		writer.Flush()
+		if err := writer.Error(); err != nil {
+			return err
+		}
+		if len(found.Items) < exportBatchSize || page*exportBatchSize >= found.Total {
+			return nil
+		}
+	}
+}
+
+func exportRow(event audit.Event) []string {
+	ip := ""
+	if event.IP != nil {
+		ip = *event.IP
+	}
+	return []string{
+		event.CreatedAt.UTC().Format(time.RFC3339),
+		guardCell(event.Actor.Name),
+		guardCell(event.Action),
+		guardCell(event.Target.Name),
+		string(event.Outcome),
+		string(event.Source),
+		guardCell(ip),
+	}
+}
+
+func guardCell(value string) string {
+	if value != "" && strings.ContainsRune(formulaStarts, rune(value[0])) {
+		return formulaGuard + value
+	}
+	return value
+}

internal/infrastructure/useCases/GetActivitySummary.go

@@ -0,0 +1,23 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"time"
+)
+
+type GetActivitySummaryUseCase struct {
+	events audit.Repository
+	now    func() time.Time
+}
+
+func NewGetActivitySummaryUseCase(events audit.Repository, now func() time.Time) *GetActivitySummaryUseCase {
+	return &GetActivitySummaryUseCase{events, now}
+}
+
+func (g *GetActivitySummaryUseCase) GetActivitySummary(query ActivityQuery) (audit.Summary, error) {
+	window, err := resolveActivityWindow(query, g.now())
+	if err != nil {
+		return audit.Summary{}, err
+	}
+	return g.events.Summary(audit.SummaryQuery{From: window.from, To: window.to})
+}

internal/infrastructure/useCases/ListActivity.go

@@ -0,0 +1,141 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/apikey"
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"RenewCMS/internal/domain/user"
+	"errors"
+	"strconv"
+	"time"
+)
+
+type ListActivityUseCase struct {
+	events   audit.Repository
+	users    user.Repository
+	articles article.Repository
+	images   image.Repository
+	apiKeys  apikey.Repository
+	now      func() time.Time
+}
+
+type ListActivityCommand struct {
+	ViewerID uint32
+	Query    ActivityQuery
+}
+
+type ActivityEntry struct {
+	Event        audit.Event
+	TargetExists bool
+}
+
+type ActivityPage struct {
+	Items []ActivityEntry
+	Total int
+	Page  int
+	Size  int
+}
+
+func NewListActivityUseCase(events audit.Repository, users user.Repository, articles article.Repository, images image.Repository, apiKeys apikey.Repository, now func() time.Time) *ListActivityUseCase {
+	return &ListActivityUseCase{events, users, articles, images, apiKeys, now}
+}
+
+func (l *ListActivityUseCase) ListActivity(command ListActivityCommand) (ActivityPage, error) {
+	filter, err := buildActivityFilter(command.Query, l.now())
+	if err != nil {
+		return ActivityPage{}, err
+	}
+	if filter.Page, filter.Size, err = resolveActivityPaging(command.Query); err != nil {
+		return ActivityPage{}, err
+	}
+	if err := l.scopeToViewer(&filter, command.ViewerID); err != nil {
+		return ActivityPage{}, err
+	}
+
+	found, err := l.events.List(filter)
+	if err != nil {
+		return ActivityPage{}, err
+	}
+	entries, err := l.withTargetState(found.Items)
+	if err != nil {
+		return ActivityPage{}, err
+	}
+	return ActivityPage{Items: entries, Total: found.Total, Page: filter.Page, Size: filter.Size}, nil
+}
+
+func (l *ListActivityUseCase) scopeToViewer(filter *audit.Filter, viewerID uint32) error {
+	viewer, err := l.users.Get(viewerID)
+	if err != nil {
+		return err
+	}
+	if viewer.Role == user.RoleOwner || viewer.Role == user.RoleAdmin {
+		return nil
+	}
+	own := audit.ActorRef{Type: audit.ActorUser, ID: &viewer.ID}
+	if filter.Actor != nil && !sameActor(*filter.Actor, own) {
+		return audit.ErrActorNotAllowed
+	}
+	filter.Actor = &own
+	return nil
+}
+
+func sameActor(a audit.ActorRef, b audit.ActorRef) bool {
+	return a.Type == b.Type && a.ID != nil && b.ID != nil && *a.ID == *b.ID
+}
+
+type targetKey struct {
+	kind string
+	id   string
+}
+
+func (l *ListActivityUseCase) withTargetState(events []audit.Event) ([]ActivityEntry, error) {
+	known := map[targetKey]bool{}
+	entries := make([]ActivityEntry, 0, len(events))
+	for _, event := range events {
+		key := targetKey{event.Target.Type, event.Target.ID}
+		exists, resolved := known[key]
+		if !resolved {
+			var err error
+			if exists, err = l.targetExists(event.Target); err != nil {
+				return nil, err
+			}
+			known[key] = exists
+		}
+		entries = append(entries, ActivityEntry{Event: event, TargetExists: exists})
+	}
+	return entries, nil
+}
+
+func (l *ListActivityUseCase) targetExists(target audit.Target) (bool, error) {
+	id, err := strconv.ParseUint(target.ID, 10, 32)
+	if err != nil {
+		return true, nil
+	}
+	switch target.Type {
+	case audit.TargetArticle:
+		_, err = l.articles.Get(uint32(id))
+		return existsUnless(err, article.ErrArticleNotFound)
+	case audit.TargetUser:
+		_, err = l.users.Get(uint32(id))
+		return existsUnless(err, user.ErrUserNotFound)
+	case audit.TargetAPIKey:
+		_, err = l.apiKeys.Get(uint32(id))
+		return existsUnless(err, apikey.ErrAPIKeyNotFound)
+	case audit.TargetImage:
+		_, err = l.images.Get(uint32(id))
+		return existsUnless(err, image.ErrImageNotFound)
+	default:
+		return true, nil
+	}
+}
+
+func existsUnless(err error, notFound error) (bool, error) {
+	if err == nil {
+		return true, nil
+	}
+	if errors.Is(err, notFound) {
+		return false, nil
+	}
+	return false, err
+}

internal/infrastructure/useCases/MergeMedia.go

@@ -2,8 +2,10 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/image"
 	"cmp"
+	"context"
 	"errors"
 	"slices"
 	"strings"
@@ -19,10 +21,11 @@ type MergeMediaUseCase struct {
 	imageRepository   image.Repository
 	articleRepository article.Repository
 	remover           mediaRemover
+	recorder          audit.Recorder
 }
 
-func NewMergeMediaUseCase(imageRepository image.Repository, articleRepository article.Repository, storage image.Storage) *MergeMediaUseCase {
+func NewMergeMediaUseCase(imageRepository image.Repository, articleRepository article.Repository, storage image.Storage, recorder audit.Recorder) *MergeMediaUseCase {
-	return &MergeMediaUseCase{imageRepository, articleRepository, mediaRemover{imageRepository, storage}}
+	return &MergeMediaUseCase{imageRepository, articleRepository, mediaRemover{imageRepository, storage}, recorder}
 }
 
 type bodyRewrite struct {
@@ -31,7 +34,30 @@ type bodyRewrite struct {
 	rewritten string
 }
 
-func (u *MergeMediaUseCase) Merge(keepId uint32, mergeIds []uint32) (MergeMediaResult, error) {
+func (u *MergeMediaUseCase) Merge(ctx context.Context, keepId uint32, mergeIds []uint32) (MergeMediaResult, error) {
+	result, err := u.merge(keepId, mergeIds)
+	event := audit.NewEvent(audit.ActionMediaMerge, audit.CategoryMedia)
+	if kept, found := u.keptImage(keepId); found {
+		event.Target = imageTarget(kept)
+	}
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return MergeMediaResult{}, err
+	}
+	event.Params = map[string]any{audit.ParamMerged: result.Merged, audit.ParamArticlesUpdated: result.ArticlesUpdated}
+	u.recorder.Record(ctx, event)
+	return result, nil
+}
+
+func (u *MergeMediaUseCase) keptImage(keepId uint32) (image.Image, bool) {
+	if keepId == 0 {
+		return image.Image{}, false
+	}
+	kept, err := u.imageRepository.Get(keepId)
+	return kept, err == nil
+}
+
+func (u *MergeMediaUseCase) merge(keepId uint32, mergeIds []uint32) (MergeMediaResult, error) {
 	if err := validateMergeRequest(keepId, mergeIds); err != nil {
 		return MergeMediaResult{}, err
 	}

internal/infrastructure/useCases/PurgeScheduler.go

@@ -1,21 +1,25 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/purge"
+	"context"
+	"errors"
 	"time"
 )
 
 type PurgeRunner interface {
-	Run(fingerprint *string) (purge.RunResult, error)
+	Execute(fingerprint *string) (purge.RunResult, error)
 }
 
 type PurgeSchedulerUseCase struct {
 	repository purge.Repository
 	runner     PurgeRunner
+	recorder   audit.Recorder
 }
 
-func NewPurgeSchedulerUseCase(repository purge.Repository, runner PurgeRunner) *PurgeSchedulerUseCase {
+func NewPurgeSchedulerUseCase(repository purge.Repository, runner PurgeRunner, recorder audit.Recorder) *PurgeSchedulerUseCase {
-	return &PurgeSchedulerUseCase{repository, runner}
+	return &PurgeSchedulerUseCase{repository, runner, recorder}
 }
 
 func (u *PurgeSchedulerUseCase) Tick(now time.Time) (purge.RunResult, bool, error) {
@@ -27,9 +31,29 @@ func (u *PurgeSchedulerUseCase) Tick(now time.Time) (purge.RunResult, bool, erro
 	if next == nil || now.Before(*next) {
 		return purge.RunResult{}, false, nil
 	}
-	result, err := u.runner.Run(nil)
+	result, err := u.runner.Execute(nil)
 	if err != nil {
+		u.recordFailedRun(err)
 		return purge.RunResult{}, false, err
 	}
+	if result.GroupsTotal > 0 {
+		event := systemPurgeEvent()
+		event.Params = purgeParams(result)
+		u.recorder.Record(context.Background(), event)
+	}
 	return result, true, nil
 }
+
+func (u *PurgeSchedulerUseCase) recordFailedRun(err error) {
+	if errors.Is(err, purge.ErrPurgeBusy) {
+		return
+	}
+	failFrom(context.Background(), u.recorder, systemPurgeEvent(), reasonFor(err))
+}
+
+func systemPurgeEvent() audit.Event {
+	event := audit.NewEvent(audit.ActionMediaPurgeScheduled, audit.CategorySystem)
+	event.Actor = audit.SystemActor()
+	event.Source = audit.SourceSystem
+	return event
+}

internal/infrastructure/useCases/RenameMedia.go

@@ -1,25 +1,43 @@
 package useCases
 
-import "RenewCMS/internal/domain/image"
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"context"
+)
 
 type RenameMediaUseCase struct {
 	imageRepository image.Repository
+	recorder        audit.Recorder
 }
 
-func NewRenameMediaUseCase(imageRepository image.Repository) *RenameMediaUseCase {
+func NewRenameMediaUseCase(imageRepository image.Repository, recorder audit.Recorder) *RenameMediaUseCase {
-	return &RenameMediaUseCase{imageRepository}
+	return &RenameMediaUseCase{imageRepository, recorder}
 }
 
-func (u *RenameMediaUseCase) Rename(id uint32, stem string) (image.Image, error) {
+func (u *RenameMediaUseCase) Rename(ctx context.Context, id uint32, stem string) (image.Image, error) {
-	validStem, err := image.ValidateFilenameStem(stem)
-	if err != nil {
-		return image.Image{}, err
-	}
-
 	current, err := u.imageRepository.Get(id)
 	if err != nil {
 		return image.Image{}, err
 	}
 
-	return u.imageRepository.Rename(id, validStem+image.ExtensionOf(current.Filename))
+	event := audit.NewEvent(audit.ActionMediaRename, audit.CategoryMedia)
+	event.Target = imageTarget(current)
+	validStem, err := image.ValidateFilenameStem(stem)
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return image.Image{}, err
+	}
+
+	renamed, err := u.imageRepository.Rename(id, validStem+image.ExtensionOf(current.Filename))
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return image.Image{}, err
+	}
+	if renamed.Filename != current.Filename {
+		event.Target = imageTarget(renamed)
+		event.Changes = []audit.Change{audit.TextChange(audit.FieldFilename, current.Filename, renamed.Filename)}
+		u.recorder.Record(ctx, event)
+	}
+	return renamed, nil
 }

internal/infrastructure/useCases/RenewInvite.go

@@ -1,10 +1,12 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/invite"
 	"RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"errors"
 	"time"
 )
@@ -14,6 +16,7 @@ type RenewInviteUseCase struct {
 	inviteRepository invite.Repository
 	hasher           hash.Hasher
 	mailer           inviteMailer
+	recorder         audit.Recorder
 }
 
 type RenewInviteCommand struct {
@@ -21,11 +24,23 @@ type RenewInviteCommand struct {
 	RenewedBy uint32
 }
 
-func NewRenewInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *RenewInviteUseCase {
+func NewRenewInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string, recorder audit.Recorder) *RenewInviteUseCase {
-	return &RenewInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}}
+	return &RenewInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}, recorder}
 }
 
-func (u *RenewInviteUseCase) RenewInvite(command RenewInviteCommand) (invite.Invite, error) {
+func (u *RenewInviteUseCase) RenewInvite(ctx context.Context, command RenewInviteCommand) (invite.Invite, error) {
+	event := audit.NewEvent(audit.ActionInviteRenew, audit.CategoryUsers)
+	renewed, err := u.renew(command)
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return invite.Invite{}, err
+	}
+	event.Target = inviteTarget(renewed)
+	u.recorder.Record(ctx, event)
+	return renewed, nil
+}
+
+func (u *RenewInviteUseCase) renew(command RenewInviteCommand) (invite.Invite, error) {
 	now := time.Now()
 
 	renewer, err := u.userRepository.Get(command.RenewedBy)

internal/infrastructure/useCases/RequestPasswordReset.go

@@ -1,9 +1,11 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"log"
 	"time"
 
@@ -15,6 +17,7 @@ type RequestPasswordResetUseCase struct {
 	hasher         hash.Hasher
 	mailRepository mail.Repository
 	publicURL      string
+	recorder       audit.Recorder
 }
 
 type MailPasswordResetData struct {
@@ -23,11 +26,11 @@ type MailPasswordResetData struct {
 	Email            string
 }
 
-func NewRequestPasswordResetUseCase(userRepository user.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *RequestPasswordResetUseCase {
+func NewRequestPasswordResetUseCase(userRepository user.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string, recorder audit.Recorder) *RequestPasswordResetUseCase {
-	return &RequestPasswordResetUseCase{userRepository, hasher, mailRepository, publicURL}
+	return &RequestPasswordResetUseCase{userRepository, hasher, mailRepository, publicURL, recorder}
 }
 
-func (g *RequestPasswordResetUseCase) RequestPasswordReset(email string) error {
+func (g *RequestPasswordResetUseCase) RequestPasswordReset(ctx context.Context, email string) error {
 	foundUser, err := g.userRepository.GetByEmail(email)
 	if err != nil {
 		return nil
@@ -46,6 +49,8 @@ func (g *RequestPasswordResetUseCase) RequestPasswordReset(email string) error {
 		return nil
 	}
 
+	g.recordRequest(ctx, foundUser)
+
 	if err := g.mailRepository.Send(foundUser.Email, "password-reset", MailPasswordResetData{
 		Host:             g.publicURL,
 		VerificationCode: rawCode,
@@ -57,3 +62,10 @@ func (g *RequestPasswordResetUseCase) RequestPasswordReset(email string) error {
 
 	return nil
 }
+
+func (g *RequestPasswordResetUseCase) recordRequest(ctx context.Context, requester user.User) {
+	event := audit.NewEvent(audit.ActionPasswordResetRequest, audit.CategoryAuth)
+	event.Actor = audit.UserActor(requester)
+	event.Security = true
+	g.recorder.Record(ctx, event)
+}

internal/infrastructure/useCases/RequestRestart.go

@@ -1,7 +1,9 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/update"
+	"context"
 	"sync"
 	"time"
 )
@@ -13,10 +15,11 @@ type RequestRestartUseCase struct {
 	requests update.RestartRequestStore
 	status   updateStatusBuilder
 	now      func() time.Time
+	recorder audit.Recorder
 	mu       sync.Mutex
 }
 
-func NewRequestRestartUseCase(store update.StatusStore, jobs update.JobStore, helper update.HelperDetector, results update.ResultStore, requests update.RestartRequestStore, currentVersion string, now func() time.Time) *RequestRestartUseCase {
+func NewRequestRestartUseCase(store update.StatusStore, jobs update.JobStore, helper update.HelperDetector, results update.ResultStore, requests update.RestartRequestStore, currentVersion string, now func() time.Time, recorder audit.Recorder) *RequestRestartUseCase {
 	return &RequestRestartUseCase{
 		jobs:     jobs,
 		helper:   helper,
@@ -24,12 +27,33 @@ func NewRequestRestartUseCase(store update.StatusStore, jobs update.JobStore, he
 		requests: requests,
 		status:   updateStatusBuilder{store: store, jobs: jobs, results: results, requests: requests, currentVersion: currentVersion, now: now},
 		now:      now,
+		recorder: recorder,
 	}
 }
 
-func (r *RequestRestartUseCase) Request(userId uint32, kind string) (update.UpdateStatus, error) {
+func (r *RequestRestartUseCase) Request(ctx context.Context, userId uint32, kind string) (update.UpdateStatus, error) {
+	event := audit.NewEvent(audit.ActionRestartRequested, audit.CategorySystem)
+	status, request, err := r.request(userId, kind)
+	if err != nil {
+		recordFailure(ctx, r.recorder, event, err, restartFailureReasons...)
+		return update.UpdateStatus{}, err
+	}
+	event.Params = restartParams(request)
+	r.recorder.Record(ctx, event)
+	return status, nil
+}
+
+func restartParams(request update.RestartRequest) map[string]any {
+	params := map[string]any{audit.ParamKind: request.Kind}
+	if request.Kind == update.RestartKindUpdate {
+		params[audit.ParamTag] = request.Tag
+	}
+	return params
+}
+
+func (r *RequestRestartUseCase) request(userId uint32, kind string) (update.UpdateStatus, update.RestartRequest, error) {
 	if !r.helper.Installed() {
-		return update.UpdateStatus{}, update.ErrNotPrepared
+		return update.UpdateStatus{}, update.RestartRequest{}, update.ErrNotPrepared
 	}
 
 	r.mu.Lock()
@@ -37,19 +61,19 @@ func (r *RequestRestartUseCase) Request(userId uint32, kind string) (update.Upda
 
 	current := r.status.build(true)
 	if err := refuseWhileBusy(current); err != nil {
-		return update.UpdateStatus{}, err
+		return update.UpdateStatus{}, update.RestartRequest{}, err
 	}
 	request, err := r.requestFor(kind, userId)
 	if err != nil {
-		return update.UpdateStatus{}, err
+		return update.UpdateStatus{}, update.RestartRequest{}, err
 	}
 	if err := r.results.Delete(); err != nil {
-		return update.UpdateStatus{}, err
+		return update.UpdateStatus{}, update.RestartRequest{}, err
 	}
 	if err := r.requests.Write(request); err != nil {
-		return update.UpdateStatus{}, err
+		return update.UpdateStatus{}, update.RestartRequest{}, err
 	}
-	return r.status.build(true), nil
+	return r.status.build(true), request, nil
 }
 
 func refuseWhileBusy(status update.UpdateStatus) error {

internal/infrastructure/useCases/ResetPassword.go

@@ -2,8 +2,10 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/apikey"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"time"
 )
 
@@ -12,13 +14,14 @@ type ResetPasswordUseCase struct {
 	hasher         hash.Hasher
 	apiKeys        apikey.Repository
 	now            func() time.Time
+	recorder       audit.Recorder
 }
 
-func NewResetPasswordUseCase(userRepository user.Repository, hasher hash.Hasher, apiKeys apikey.Repository, now func() time.Time) *ResetPasswordUseCase {
+func NewResetPasswordUseCase(userRepository user.Repository, hasher hash.Hasher, apiKeys apikey.Repository, now func() time.Time, recorder audit.Recorder) *ResetPasswordUseCase {
-	return &ResetPasswordUseCase{userRepository, hasher, apiKeys, now}
+	return &ResetPasswordUseCase{userRepository, hasher, apiKeys, now, recorder}
 }
 
-func (r *ResetPasswordUseCase) ResetPassword(email string, code string, newPassword string) error {
+func (r *ResetPasswordUseCase) ResetPassword(ctx context.Context, email string, code string, newPassword string) error {
 	dbUser, err := r.userRepository.GetByEmail(email)
 	if err != nil {
 		return user.ErrInvalidPasswordResetCode
@@ -41,5 +44,13 @@ func (r *ResetPasswordUseCase) ResetPassword(email string, code string, newPassw
 		return err
 	}
 
-	return r.apiKeys.RevokeAllByUser(dbUser.ID, r.now())
+	if err := r.apiKeys.RevokeAllByUser(dbUser.ID, r.now()); err != nil {
+		return err
+	}
+
+	event := audit.NewEvent(audit.ActionPasswordResetDone, audit.CategoryAuth)
+	event.Actor = audit.UserActor(dbUser)
+	event.Security = true
+	r.recorder.Record(ctx, event)
+	return nil
 }

internal/infrastructure/useCases/RevokeAPIKey.go

@@ -2,7 +2,9 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/apikey"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"time"
 )
 
@@ -10,13 +12,14 @@ type RevokeAPIKeyUseCase struct {
 	apiKeyRepository apikey.Repository
 	userRepository   user.Repository
 	now              func() time.Time
+	recorder         audit.Recorder
 }
 
-func NewRevokeAPIKeyUseCase(apiKeyRepository apikey.Repository, userRepository user.Repository, now func() time.Time) *RevokeAPIKeyUseCase {
+func NewRevokeAPIKeyUseCase(apiKeyRepository apikey.Repository, userRepository user.Repository, now func() time.Time, recorder audit.Recorder) *RevokeAPIKeyUseCase {
-	return &RevokeAPIKeyUseCase{apiKeyRepository, userRepository, now}
+	return &RevokeAPIKeyUseCase{apiKeyRepository, userRepository, now, recorder}
 }
 
-func (r *RevokeAPIKeyUseCase) RevokeAPIKey(requesterId uint32, keyId uint32) error {
+func (r *RevokeAPIKeyUseCase) RevokeAPIKey(ctx context.Context, requesterId uint32, keyId uint32) error {
 	key, err := r.apiKeyRepository.Get(keyId)
 	if err != nil {
 		return err
@@ -35,5 +38,12 @@ func (r *RevokeAPIKeyUseCase) RevokeAPIKey(requesterId uint32, keyId uint32) err
 		return nil
 	}
 
-	return r.apiKeyRepository.Revoke(key.ID, r.now())
+	if err := r.apiKeyRepository.Revoke(key.ID, r.now()); err != nil {
+		return err
+	}
+
+	event := audit.NewEvent(audit.ActionAPIKeyRevoke, audit.CategoryAPIKeys)
+	event.Target = audit.APIKeyTarget(key.ID, key.Name)
+	r.recorder.Record(ctx, event)
+	return nil
 }

internal/infrastructure/useCases/RunPurge.go

@@ -2,8 +2,10 @@ package useCases
 
 import (
 	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/image"
 	"RenewCMS/internal/domain/purge"
+	"context"
 	"log"
 	"slices"
 	"sync"
@@ -16,20 +18,42 @@ type RunPurgeUseCase struct {
 	repository purge.Repository
 	now        func() time.Time
 	logger     *log.Logger
+	recorder   audit.Recorder
 	guard      sync.Mutex
 }
 
-func NewRunPurgeUseCase(imageRepository image.Repository, articleRepository article.Repository, merge *MergeMediaUseCase, repository purge.Repository, now func() time.Time, logger *log.Logger) *RunPurgeUseCase {
+func NewRunPurgeUseCase(imageRepository image.Repository, articleRepository article.Repository, merge *MergeMediaUseCase, repository purge.Repository, now func() time.Time, logger *log.Logger, recorder audit.Recorder) *RunPurgeUseCase {
 	return &RunPurgeUseCase{
 		planner:    &purgePlanner{imageRepository, articleRepository},
 		merge:      merge,
 		repository: repository,
 		now:        now,
 		logger:     logger,
+		recorder:   recorder,
 	}
 }
 
-func (u *RunPurgeUseCase) Run(fingerprint *string) (purge.RunResult, error) {
+func (u *RunPurgeUseCase) Run(ctx context.Context, fingerprint *string) (purge.RunResult, error) {
+	result, err := u.Execute(fingerprint)
+	event := audit.NewEvent(audit.ActionMediaPurge, audit.CategoryMedia)
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return purge.RunResult{}, err
+	}
+	event.Params = purgeParams(result)
+	u.recorder.Record(ctx, event)
+	return result, nil
+}
+
+func purgeParams(result purge.RunResult) map[string]any {
+	params := map[string]any{audit.ParamMerged: result.Merged, audit.ParamArticlesUpdated: result.ArticlesUpdated}
+	if result.FailedGroups > 0 {
+		params[audit.ParamFailedGroups] = result.FailedGroups
+	}
+	return params
+}
+
+func (u *RunPurgeUseCase) Execute(fingerprint *string) (purge.RunResult, error) {
 	if !u.guard.TryLock() {
 		return purge.RunResult{}, purge.ErrPurgeBusy
 	}
@@ -55,7 +79,7 @@ func (u *RunPurgeUseCase) mergeGroups(plan purgePlan) purge.RunResult {
 	result := purge.RunResult{GroupsTotal: len(plan.groups)}
 	updated := map[uint32]bool{}
 	for _, group := range plan.groups {
-		merged, err := u.merge.Merge(group.kept.ID, slices.Clone(group.mergedIds))
+		merged, err := u.merge.merge(group.kept.ID, slices.Clone(group.mergedIds))
 		if err != nil {
 			result.FailedGroups++
 			continue

internal/infrastructure/useCases/StartUpdateDownload.go

@@ -1,7 +1,9 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/update"
+	"context"
 	"errors"
 	"fmt"
 	"sync"
@@ -24,6 +26,7 @@ type StartUpdateDownloadUseCase struct {
 	platform       update.Platform
 	feedHost       string
 	now            func() time.Time
+	recorder       audit.Recorder
 	mu             sync.Mutex
 }
 
@@ -43,6 +46,7 @@ type StartUpdateDownloadDependencies struct {
 	Platform       update.Platform
 	FeedURL        string
 	Now            func() time.Time
+	Recorder       audit.Recorder
 }
 
 type jobFailure struct {
@@ -78,10 +82,19 @@ func NewStartUpdateDownloadUseCase(dependencies StartUpdateDownloadDependencies)
 		platform:       dependencies.Platform,
 		feedHost:       update.HostOf(dependencies.FeedURL),
 		now:            dependencies.Now,
+		recorder:       dependencies.Recorder,
 	}
 }
 
-func (s *StartUpdateDownloadUseCase) Start() (update.UpdateStatus, error) {
+func (s *StartUpdateDownloadUseCase) Start(ctx context.Context) (update.UpdateStatus, error) {
+	status, err := s.start(ctx)
+	if err != nil {
+		recordFailure(ctx, s.recorder, audit.NewEvent(audit.ActionUpdateDownloaded, audit.CategorySystem), err)
+	}
+	return status, err
+}
+
+func (s *StartUpdateDownloadUseCase) start(ctx context.Context) (update.UpdateStatus, error) {
 	if !s.helper.Installed() {
 		return update.UpdateStatus{}, update.ErrNotPrepared
 	}
@@ -118,7 +131,7 @@ func (s *StartUpdateDownloadUseCase) Start() (update.UpdateStatus, error) {
 		return update.UpdateStatus{}, err
 	}
 	status := s.status.build(true)
-	go s.run(job, binary, checksums, signature)
+	go s.run(context.WithoutCancel(ctx), job, binary, checksums, signature)
 
 	return status, nil
 }
@@ -139,15 +152,19 @@ func (s *StartUpdateDownloadUseCase) preflight(result update.CheckResult) (binar
 	return found[0], found[1], found[2], nil
 }
 
-func (s *StartUpdateDownloadUseCase) run(job update.Job, binary, checksums, signature update.Asset) {
+func (s *StartUpdateDownloadUseCase) run(ctx context.Context, job update.Job, binary, checksums, signature update.Asset) {
 	defer func() {
 		if recovered := recover(); recovered != nil {
-			s.fail(job, downloadFailure(fmt.Errorf("panic: %v", recovered)))
+			s.fail(ctx, job, downloadFailure(fmt.Errorf("panic: %v", recovered)))
 		}
 	}()
 	if err := s.execute(&job, binary, checksums, signature); err != nil {
-		s.fail(job, err)
+		s.fail(ctx, job, err)
+		return
 	}
+	event := audit.NewEvent(audit.ActionUpdateDownloaded, audit.CategorySystem)
+	event.Target = audit.ReleaseTarget(job.Tag)
+	s.recorder.Record(ctx, event)
 }
 
 func (s *StartUpdateDownloadUseCase) execute(job *update.Job, binary, checksums, signature update.Asset) error {
@@ -263,7 +280,7 @@ func downloadFailure(err error) error {
 	return jobFailure{kind: update.ErrorKindDownload, reason: err}
 }
 
-func (s *StartUpdateDownloadUseCase) fail(job update.Job, err error) {
+func (s *StartUpdateDownloadUseCase) fail(ctx context.Context, job update.Job, err error) {
 	kind := update.ErrorKindDownload
 	var failure jobFailure
 	if errors.As(err, &failure) {
@@ -279,4 +296,7 @@ func (s *StartUpdateDownloadUseCase) fail(job update.Job, err error) {
 	if saveErr := s.jobs.Save(job); saveErr != nil {
 		s.logger.Printf("update job record could not be saved: %v", saveErr)
 	}
+	event := audit.NewEvent(audit.ActionUpdateDownloaded, audit.CategorySystem)
+	event.Target = audit.ReleaseTarget(job.Tag)
+	failFrom(ctx, s.recorder, event, downloadFailureReasons[kind])
 }

internal/infrastructure/useCases/UpdateArticle.go

@@ -1,28 +1,69 @@
 package useCases
 
-import "RenewCMS/internal/domain/article"
+import (
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"context"
+)
 
 type UpdateArticleUseCase struct {
 	articleRepository article.Repository
 	bodyRenderer      article.BodyRenderer
+	recorder          audit.Recorder
 }
 
-func NewUpdateArticleUseCase(articleRepository article.Repository, bodyRenderer article.BodyRenderer) *UpdateArticleUseCase {
+func NewUpdateArticleUseCase(articleRepository article.Repository, bodyRenderer article.BodyRenderer, recorder audit.Recorder) *UpdateArticleUseCase {
-	return &UpdateArticleUseCase{articleRepository, bodyRenderer}
+	return &UpdateArticleUseCase{articleRepository, bodyRenderer, recorder}
 }
 
-func (g *UpdateArticleUseCase) UpdateBody(id uint32, body string, format article.BodyFormat) (article.Article, error) {
+func (g *UpdateArticleUseCase) UpdateBody(ctx context.Context, id uint32, body string, format article.BodyFormat) (article.Article, error) {
+	before, err := g.articleRepository.Get(id)
+	if err != nil {
+		return article.Article{}, err
+	}
 	updated, err := g.articleRepository.UpdateBody(id, body)
 	if err != nil {
+		g.recordFailure(ctx, audit.ActionArticleEdit, before, err)
 		return article.Article{}, err
 	}
+	g.recordChange(ctx, audit.ActionArticleEdit, before, updated)
 	return renderArticle(g.bodyRenderer, updated, format)
 }
 
-func (g *UpdateArticleUseCase) UpdateIsOnline(id uint32, isOnline bool, format article.BodyFormat) (article.Article, error) {
+func (g *UpdateArticleUseCase) UpdateIsOnline(ctx context.Context, id uint32, isOnline bool, format article.BodyFormat) (article.Article, error) {
-	updated, err := g.articleRepository.UpdateIsOnline(id, isOnline)
+	before, err := g.articleRepository.Get(id)
 	if err != nil {
 		return article.Article{}, err
 	}
+	updated, err := g.articleRepository.UpdateIsOnline(id, isOnline)
+	if err != nil {
+		g.recordFailure(ctx, publishAction(isOnline), before, err)
+		return article.Article{}, err
+	}
+	g.recordChange(ctx, publishAction(isOnline), before, updated)
 	return renderArticle(g.bodyRenderer, updated, format)
 }
+
+func publishAction(isOnline bool) string {
+	if isOnline {
+		return audit.ActionArticlePublish
+	}
+	return audit.ActionArticleUnpublish
+}
+
+func (g *UpdateArticleUseCase) recordChange(ctx context.Context, action string, before article.Article, after article.Article) {
+	changes := audit.ArticleChanges(before, after)
+	if len(changes) == 0 {
+		return
+	}
+	event := audit.NewEvent(action, audit.CategoryArticles)
+	event.Target = articleTarget(after)
+	event.Changes = changes
+	g.recorder.Record(ctx, event)
+}
+
+func (g *UpdateArticleUseCase) recordFailure(ctx context.Context, action string, before article.Article, cause error) {
+	event := audit.NewEvent(action, audit.CategoryArticles)
+	event.Target = articleTarget(before)
+	recordFailure(ctx, g.recorder, event, cause)
+}

internal/infrastructure/useCases/UpdateUserProfile.go

@@ -1,7 +1,9 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"strings"
 	"unicode/utf8"
 )
@@ -10,16 +12,40 @@ const maxDisplayNameRunes = 60
 
 type UpdateUserProfileUseCase struct {
 	userRepository user.Repository
+	recorder       audit.Recorder
 }
 
-func NewUpdateUserProfileUseCase(userRepository user.Repository) *UpdateUserProfileUseCase {
+func NewUpdateUserProfileUseCase(userRepository user.Repository, recorder audit.Recorder) *UpdateUserProfileUseCase {
-	return &UpdateUserProfileUseCase{userRepository}
+	return &UpdateUserProfileUseCase{userRepository, recorder}
 }
 
-func (u *UpdateUserProfileUseCase) UpdateDisplayName(userId uint32, displayName string) (user.User, error) {
+func (u *UpdateUserProfileUseCase) UpdateDisplayName(ctx context.Context, userId uint32, displayName string) (user.User, error) {
+	before, err := u.userRepository.Get(userId)
+	if err != nil {
+		return user.User{}, err
+	}
+
+	event := audit.NewEvent(audit.ActionUserUpdateProfile, audit.CategoryUsers)
+	event.Target = userTarget(before)
 	trimmed := strings.TrimSpace(displayName)
 	if utf8.RuneCountInString(trimmed) > maxDisplayNameRunes {
+		recordFailure(ctx, u.recorder, event, user.ErrInvalidDisplayName)
 		return user.User{}, user.ErrInvalidDisplayName
 	}
-	return u.userRepository.UpdateDisplayName(userId, trimmed)
+
+	updated, err := u.userRepository.UpdateDisplayName(userId, trimmed)
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return user.User{}, err
+	}
+	if updated.DisplayName != before.DisplayName {
+		event.Target = userTarget(updated)
+		event.Changes = []audit.Change{audit.TextChange(audit.FieldDisplayName, before.DisplayName, updated.DisplayName)}
+		u.recorder.Record(ctx, event)
+	}
+	return updated, nil
+}
+
+func userTarget(u user.User) audit.Target {
+	return audit.NewTarget(audit.TargetUser, u.ID, audit.UserActor(u).Name)
 }

internal/infrastructure/useCases/VerifyUser.go

@@ -1,26 +1,42 @@
 package useCases
 
 import (
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/hash"
 	"RenewCMS/internal/domain/user"
+	"context"
 	"time"
 )
 
 type VerifyUserUseCase struct {
 	userRepository user.Repository
 	hasher         hash.Hasher
+	recorder       audit.Recorder
 }
 
-func NewVerifyUserUseCase(userRepository user.Repository, hasher hash.Hasher) *VerifyUserUseCase {
+func NewVerifyUserUseCase(userRepository user.Repository, hasher hash.Hasher, recorder audit.Recorder) *VerifyUserUseCase {
-	return &VerifyUserUseCase{userRepository, hasher}
+	return &VerifyUserUseCase{userRepository, hasher, recorder}
 }
 
-func (v *VerifyUserUseCase) Verify(userId uint32, code string) (user.User, error) {
+func (v *VerifyUserUseCase) Verify(ctx context.Context, userId uint32, code string) (user.User, error) {
 	dbUser, err := v.userRepository.Get(userId)
 	if err != nil {
 		return user.User{}, err
 	}
 
+	event := audit.NewEvent(audit.ActionUserVerify, audit.CategoryUsers)
+	event.Actor = audit.UserActor(dbUser)
+	event.Target = audit.NewTarget(audit.TargetUser, dbUser.ID, dbUser.Username)
+	verified, err := v.verify(dbUser, code)
+	if err != nil {
+		recordFailure(ctx, v.recorder, event, err)
+		return user.User{}, err
+	}
+	v.recorder.Record(ctx, event)
+	return verified, nil
+}
+
+func (v *VerifyUserUseCase) verify(dbUser user.User, code string) (user.User, error) {
 	if dbUser.VerificationCode == "" || v.hasher.Compare(dbUser.VerificationCode, code) != nil {
 		return user.User{}, user.ErrInvalidVerificationCode
 	}
@@ -29,5 +45,5 @@ func (v *VerifyUserUseCase) Verify(userId uint32, code string) (user.User, error
 		return user.User{}, user.ErrVerificationCodeExpired
 	}
 
-	return v.userRepository.ClearVerificationCode(userId)
+	return v.userRepository.ClearVerificationCode(dbUser.ID)
 }

internal/infrastructure/useCases/activityQuery.go

@@ -0,0 +1,144 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"time"
+)
+
+const (
+	activityRangeToday  = "today"
+	activityRange7Days  = "7d"
+	activityRange30Days = "30d"
+	activityRangeCustom = "custom"
+	activityDateLayout  = "2006-01-02"
+	activityDefaultSize = 25
+	outcomeAll          = "all"
+	securityOnly        = "true"
+)
+
+var activityPageSizes = []int{25, 50, 100}
+
+type ActivityQuery struct {
+	Q        string
+	Actor    string
+	Category string
+	Outcome  string
+	Security string
+	Range    string
+	From     string
+	To       string
+	Page     int
+	Size     int
+}
+
+type activityWindow struct {
+	from     time.Time
+	to       time.Time
+	explicit bool
+}
+
+func resolveActivityWindow(query ActivityQuery, now time.Time) (activityWindow, error) {
+	utc := now.UTC()
+	end := utc.Add(time.Second)
+	switch query.Range {
+	case "", activityRange7Days:
+		return activityWindow{from: end.AddDate(0, 0, -7), to: end}, nil
+	case activityRange30Days:
+		return activityWindow{from: end.AddDate(0, 0, -30), to: end}, nil
+	case activityRangeToday:
+		return activityWindow{from: time.Date(utc.Year(), utc.Month(), utc.Day(), 0, 0, 0, 0, time.UTC), to: end}, nil
+	case activityRangeCustom:
+		return resolveCustomWindow(query)
+	default:
+		return activityWindow{}, audit.ErrInvalidFilter
+	}
+}
+
+func resolveCustomWindow(query ActivityQuery) (activityWindow, error) {
+	from, err := time.Parse(activityDateLayout, query.From)
+	if err != nil {
+		return activityWindow{}, audit.ErrInvalidFilter
+	}
+	last, err := time.Parse(activityDateLayout, query.To)
+	if err != nil || last.Before(from) {
+		return activityWindow{}, audit.ErrInvalidFilter
+	}
+	return activityWindow{from: from, to: last.AddDate(0, 0, 1), explicit: true}, nil
+}
+
+func buildActivityFilter(query ActivityQuery, now time.Time) (audit.Filter, error) {
+	window, err := resolveActivityWindow(query, now)
+	if err != nil {
+		return audit.Filter{}, err
+	}
+	filter := audit.Filter{Query: query.Q, From: &window.from}
+	if window.explicit {
+		filter.To = &window.to
+	}
+	if filter.Outcome, err = parseActivityOutcome(query.Outcome); err != nil {
+		return audit.Filter{}, err
+	}
+	if filter.Security, err = parseActivitySecurity(query.Security); err != nil {
+		return audit.Filter{}, err
+	}
+	if query.Category != "" {
+		if filter.Category, err = audit.ParseCategory(query.Category); err != nil {
+			return audit.Filter{}, err
+		}
+	}
+	if query.Actor != "" {
+		actor, err := audit.ParseActor(query.Actor)
+		if err != nil {
+			return audit.Filter{}, err
+		}
+		filter.Actor = &actor
+	}
+	return filter, nil
+}
+
+func parseActivityOutcome(raw string) (audit.Outcome, error) {
+	switch raw {
+	case "", outcomeAll:
+		return "", nil
+	case string(audit.OutcomeSuccess):
+		return audit.OutcomeSuccess, nil
+	case string(audit.OutcomeFailed):
+		return audit.OutcomeFailed, nil
+	default:
+		return "", audit.ErrInvalidFilter
+	}
+}
+
+func parseActivitySecurity(raw string) (bool, error) {
+	switch raw {
+	case "":
+		return false, nil
+	case securityOnly:
+		return true, nil
+	default:
+		return false, audit.ErrInvalidFilter
+	}
+}
+
+func resolveActivityPaging(query ActivityQuery) (int, int, error) {
+	page, size := query.Page, query.Size
+	if page == 0 {
+		page = 1
+	}
+	if size == 0 {
+		size = activityDefaultSize
+	}
+	if page < 1 || !containsInt(activityPageSizes, size) {
+		return 0, 0, audit.ErrInvalidFilter
+	}
+	return page, size, nil
+}
+
+func containsInt(values []int, wanted int) bool {
+	for _, value := range values {
+		if value == wanted {
+			return true
+		}
+	}
+	return false
+}

internal/infrastructure/useCases/auditFailures.go

@@ -0,0 +1,101 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/purge"
+	"RenewCMS/internal/domain/update"
+	"RenewCMS/internal/domain/user"
+	"context"
+	"errors"
+	"slices"
+)
+
+const GenericFailureReason = "Something went wrong on our side. Please try again."
+
+type failureReason struct {
+	cause  error
+	reason string
+}
+
+var failureReasons = []failureReason{
+	{article.ErrInvalidTitle, "The title must be between 3 and 200 characters."},
+	{image.ErrImageTypeNotAllowed, "The file must be a PNG, JPEG, WEBP or SVG image."},
+	{image.ErrImageTooLarge, "The file is too large to upload."},
+	{image.ErrImageUnreadable, "The image could not be read."},
+	{image.ErrInvalidFilename, "That file name is not valid."},
+	{image.ErrInvalidMergeRequest, "The merge request is not valid."},
+	{image.ErrMergeCopyMissing, "One of the copies no longer exists."},
+	{image.ErrMergeHashMismatch, "The images are not identical copies."},
+	{purge.ErrPurgeConflict, "The library changed since the preview. Review it again."},
+	{purge.ErrPurgeBusy, "A purge is already running."},
+	{user.ErrRegistrationClosed, "Registration is closed on this site."},
+	{user.ErrVerificationEmailNotSent, "The verification email could not be sent."},
+	{user.ErrInvalidVerificationCode, "The verification code is not valid."},
+	{user.ErrVerificationCodeExpired, "The verification code has expired."},
+	{user.ErrInvalidDisplayName, "That display name is too long."},
+	{user.ErrUsernameTaken, "That username is already taken."},
+	{invite.ErrEmailHasAccount, "That email already has an account."},
+	{invite.ErrPendingInvite, "An invitation is already pending for that email."},
+	{invite.ErrInviteEmailNotSent, "The invitation email could not be sent."},
+	{invite.ErrInviteAlreadyAccepted, "That invitation was already accepted."},
+	{invite.ErrInviteInvalid, "That invitation is not valid."},
+	{invite.ErrInviteExpired, "That invitation has expired."},
+	{update.ErrFeedUnavailable, "The release feed could not be reached."},
+	{update.ErrNoRelease, "No release was found."},
+	{update.ErrNotPrepared, "This server cannot apply updates."},
+	{update.ErrJobInProgress, "An update is already being downloaded."},
+	{update.ErrRestartPending, "A restart is already pending."},
+	{update.ErrNothingToUpdate, "There is nothing to update."},
+	{update.ErrPreflightRefused, "The update cannot be downloaded."},
+	{update.ErrRestartKindMismatch, "The requested restart does not match the server state."},
+}
+
+var restartFailureReasons = []failureReason{
+	{update.ErrJobInProgress, "An update is still being downloaded."},
+}
+
+var downloadFailureReasons = map[string]string{
+	update.ErrorKindDownload:     "The update could not be downloaded.",
+	update.ErrorKindVerification: "The downloaded update failed its integrity check.",
+}
+
+var notFoundCauses = []error{
+	article.ErrArticleNotFound,
+	image.ErrImageNotFound,
+	invite.ErrInviteNotFound,
+	user.ErrUserNotFound,
+}
+
+func reasonFor(err error, overrides ...failureReason) string {
+	for _, candidate := range slices.Concat(overrides, failureReasons) {
+		if errors.Is(err, candidate.cause) {
+			return candidate.reason
+		}
+	}
+	return GenericFailureReason
+}
+
+func isNotFound(err error) bool {
+	for _, cause := range notFoundCauses {
+		if errors.Is(err, cause) {
+			return true
+		}
+	}
+	return false
+}
+
+func recordFailure(ctx context.Context, recorder audit.Recorder, event audit.Event, err error, overrides ...failureReason) {
+	if isNotFound(err) {
+		return
+	}
+	failFrom(ctx, recorder, event, reasonFor(err, overrides...))
+}
+
+func failFrom(ctx context.Context, recorder audit.Recorder, event audit.Event, reason string) {
+	event.Outcome = audit.OutcomeFailed
+	event.FailureReason = &reason
+	recorder.Record(ctx, event)
+}

scripts/mutate.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+work="$(mktemp -d)"
+trap 'rm -rf "$work"' EXIT
+
+native() {
+	if command -v cygpath >/dev/null 2>&1; then
+		cygpath -m "$1"
+	else
+		printf '%s' "$1"
+	fi
+}
+
+repo="$work/repo"
+mkdir -p "$repo" "$work/tmp" "$root/tmp"
+
+tar -C "$root" -c \
+	--exclude=./bin --exclude=./web --exclude=./node_modules --exclude=./.git \
+	--exclude=./.task --exclude=./tmp --exclude=./data --exclude=./.claude \
+	--exclude=./internal/infrastructure/assets/dist --exclude='*.exe' --exclude='*.db' . |
+	tar -C "$repo" -x
+
+export GOCACHE="$(native "$work/gocache")"
+export TEMP="$(native "$work/tmp")"
+export TMP="$TEMP"
+export TMPDIR="$TEMP"
+
+cd "$repo"
+code=0
+gremlins unleash --integration --tags nofrontend --workers 4 \
+	--coverpkg=./internal/infrastructure/useCases/...,./api/middleware/...,./api/pkg/claims/... \
+	--timeout-coefficient 10 --output "$(native "$root/tmp/gremlins.json")" \
+	./internal/infrastructure/useCases ./api/middleware ./api/pkg/claims || code=$?
+go clean -cache >/dev/null 2>&1 || true
+exit "$code"

test/accept_invitation_atomic_test.go

@@ -116,7 +116,7 @@ func newAtomicAcceptFixture(t *testing.T, wrap func(db *gorm.DB, repo invite.Rep
 	hasher := atomicPlainHasher{}
 	handler := auth.NewAcceptInviteHandler(
 		useCases.NewGetInviteUseCase(invites, hasher),
-		useCases.NewAcceptInviteUseCase(users, invites, hasher),
+		useCases.NewAcceptInviteUseCase(users, invites, hasher, discardRecorder),
 		jwtauth.New("HS256", []byte("test-secret"), nil),
 		true,
 	)

test/accept_invitation_test.go

@@ -56,21 +56,21 @@ func newAcceptInviteFixture(t *testing.T, maxAttempts int) *acceptInviteFixture
 	getUser := useCases.NewGetUserUseCase(f.users)
 	acceptHandler := auth.NewAcceptInviteHandler(
 		useCases.NewGetInviteUseCase(f.invites, f.hasher),
-		useCases.NewAcceptInviteUseCase(f.users, f.invites, f.hasher),
+		useCases.NewAcceptInviteUseCase(f.users, f.invites, f.hasher, discardRecorder),
 		f.token,
 		true,
 	)
 	meHandler := auth.NewMeHandler(getUser)
 	listHandler := userhandler.NewInviteHandler(
-		useCases.NewCreateInviteUseCase(f.users, f.invites, f.hasher, f.mail, invitePublicURL),
+		useCases.NewCreateInviteUseCase(f.users, f.invites, f.hasher, f.mail, invitePublicURL, discardRecorder),
 		nil,
 		nil,
 		useCases.NewListUsersAndInvitesUseCase(f.users, f.invites),
 	)
 	registerHandler := auth.NewLoginHandler(
 		f.token,
-		useCases.NewCreateUserUseCase(f.users, f.hasher, f.mail, invitePublicURL),
+		useCases.NewCreateUserUseCase(f.users, f.hasher, f.mail, invitePublicURL, discardRecorder),
-		useCases.NewAuthenticateUserUseCase(f.users, f.hasher),
+		useCases.NewAuthenticateUserUseCase(f.users, f.hasher, discardRecorder),
 		true,
 	)
 
@@ -500,13 +500,13 @@ func TestAcceptInviteUseCase(t *testing.T) {
 	newUseCase := func() (*useCases.AcceptInviteUseCase, *mockUserRepo, *inviteFakeRepo, *stubHasher) {
 		users, invites, hasher := inviteInviterRepo(""), newInviteFakeRepo(), &stubHasher{}
 		invites.users = users
-		return useCases.NewAcceptInviteUseCase(users, invites, hasher), users, invites, hasher
+		return useCases.NewAcceptInviteUseCase(users, invites, hasher, discardRecorder), users, invites, hasher
 	}
 	command := useCases.AcceptInviteCommand{Code: acceptCode, Username: "lea", Password: acceptPassword}
 
 	t.Run("unknown code is invalid", func(t *testing.T) {
 		uc, _, _, _ := newUseCase()
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, invite.ErrInviteInvalid) {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, invite.ErrInviteInvalid) {
 			t.Errorf("expected ErrInviteInvalid, got %v", err)
 		}
 	})
@@ -514,7 +514,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 	t.Run("empty code is invalid without hashing", func(t *testing.T) {
 		uc, _, invites, hasher := newUseCase()
 		invites.seed(pendingInvite(acceptEmail))
-		if _, err := uc.AcceptInvite(useCases.AcceptInviteCommand{Username: "lea", Password: acceptPassword}); !errors.Is(err, invite.ErrInviteInvalid) || hasher.compareCalls != 0 {
+		if _, err := uc.AcceptInvite(testCtx, useCases.AcceptInviteCommand{Username: "lea", Password: acceptPassword}); !errors.Is(err, invite.ErrInviteInvalid) || hasher.compareCalls != 0 {
 			t.Errorf("expected ErrInviteInvalid, got %v", err)
 		}
 	})
@@ -524,7 +524,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored := expiredInvite(acceptEmail)
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, invite.ErrInviteExpired) {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, invite.ErrInviteExpired) {
 			t.Errorf("expected ErrInviteExpired, got %v", err)
 		}
 	})
@@ -534,7 +534,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored := pendingInvite(acceptEmail)
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
-		_, err := uc.AcceptInvite(useCases.AcceptInviteCommand{Code: acceptCode, Username: "marta", Password: acceptPassword})
+		_, err := uc.AcceptInvite(testCtx, useCases.AcceptInviteCommand{Code: acceptCode, Username: "marta", Password: acceptPassword})
 		if !errors.Is(err, user.ErrUsernameTaken) || len(users.users) != 1 {
 			t.Errorf("expected ErrUsernameTaken, got %v", err)
 		}
@@ -546,7 +546,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
 		users.fail.failNext("GetByUsername")
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, errRepositoryFailure) {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, errRepositoryFailure) {
 			t.Errorf("expected repository failure, got %v", err)
 		}
 	})
@@ -557,7 +557,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
 		users.users[8] = user.User{ID: 8, Username: "leam", Email: "LEA.martin@renew.example"}
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, invite.ErrEmailHasAccount) {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, invite.ErrEmailHasAccount) {
 			t.Errorf("expected ErrEmailHasAccount, got %v", err)
 		}
 	})
@@ -574,8 +574,8 @@ func TestAcceptInviteUseCase(t *testing.T) {
 			invites.invites[seeded.ID] = seeded
 			users.users[8] = user.User{ID: 8, Username: "lea2", Email: acceptEmail}
 		}}
-		uc := useCases.NewAcceptInviteUseCase(users, racing, hasher)
+		uc := useCases.NewAcceptInviteUseCase(users, racing, hasher, discardRecorder)
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, invite.ErrInviteInvalid) {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, invite.ErrInviteInvalid) {
 			t.Errorf("expected ErrInviteInvalid, got %v", err)
 		}
 	})
@@ -586,7 +586,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
 		hasher.hashErr = errors.New("hash boom")
-		if _, err := uc.AcceptInvite(command); err == nil || len(users.users) != 1 {
+		if _, err := uc.AcceptInvite(testCtx, command); err == nil || len(users.users) != 1 {
 			t.Errorf("expected failure without a user, got %v", err)
 		}
 	})
@@ -597,7 +597,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored.HashedCode = "hashed:" + acceptCode
 		seeded := invites.seed(stored)
 		users.fail.failNext("Create")
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, errRepositoryFailure) || invites.invites[seeded.ID].AcceptedAt != nil {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, errRepositoryFailure) || invites.invites[seeded.ID].AcceptedAt != nil {
 			t.Errorf("expected repository failure and a pending invite, got %v", err)
 		}
 	})
@@ -609,7 +609,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		seeded := invites.seed(stored)
 		invites.fail.failNextWith("MarkAccepted", errors.New("mark down"))
 		users.fail.failNextWith("Delete", errors.New("delete down"))
-		_, err := uc.AcceptInvite(command)
+		_, err := uc.AcceptInvite(testCtx, command)
 		if err == nil || !strings.Contains(err.Error(), "mark down") || strings.Contains(err.Error(), "delete down") {
 			t.Errorf("unexpected error %v", err)
 		}
@@ -624,7 +624,7 @@ func TestAcceptInviteUseCase(t *testing.T) {
 		stored.HashedCode = "hashed:" + acceptCode
 		invites.seed(stored)
 		invites.fail.failNextWith("MarkAccepted", invite.ErrInviteNotFound)
-		if _, err := uc.AcceptInvite(command); !errors.Is(err, invite.ErrInviteInvalid) || len(users.users) != 1 {
+		if _, err := uc.AcceptInvite(testCtx, command); !errors.Is(err, invite.ErrInviteInvalid) || len(users.users) != 1 {
 			t.Errorf("expected ErrInviteInvalid, got %v", err)
 		}
 	})

test/account_verification_http_test.go

@@ -20,7 +20,7 @@ import (
 func newAccountVerificationRouter(userRepo *mockUserRepo, token *jwtauth.JWTAuth) *chi.Mux {
 	hasher := &stubHasher{}
 	verificationHandler := auth.NewVerificationHandler(
-		useCases.NewVerifyUserUseCase(userRepo, hasher),
+		useCases.NewVerifyUserUseCase(userRepo, hasher, discardRecorder),
 		useCases.NewCancelRegistrationUseCase(userRepo),
 		true,
 	)

test/account_verification_test.go

@@ -16,9 +16,9 @@ func TestAccountVerificationUseCase(t *testing.T) {
 			VerificationCode:       "hashed:right-code",
 			VerificationExpiration: time.Now().Add(time.Hour),
 		}
-		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{})
+		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{}, discardRecorder)
 
-		_, err := uc.Verify(3, "wrong-code")
+		_, err := uc.Verify(testCtx, 3, "wrong-code")
 
 		if !errors.Is(err, user.ErrInvalidVerificationCode) {
 			t.Fatalf("expected ErrInvalidVerificationCode, got %v", err)
@@ -35,9 +35,9 @@ func TestAccountVerificationUseCase(t *testing.T) {
 			VerificationCode:       "hashed:right-code",
 			VerificationExpiration: time.Now().Add(-time.Hour),
 		}
-		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{})
+		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{}, discardRecorder)
 
-		_, err := uc.Verify(3, "right-code")
+		_, err := uc.Verify(testCtx, 3, "right-code")
 
 		if !errors.Is(err, user.ErrVerificationCodeExpired) {
 			t.Fatalf("expected ErrVerificationCodeExpired, got %v", err)
@@ -54,9 +54,9 @@ func TestAccountVerificationUseCase(t *testing.T) {
 			VerificationCode:       "hashed:right-code",
 			VerificationExpiration: time.Now().Add(time.Hour),
 		}
-		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{})
+		uc := useCases.NewVerifyUserUseCase(repo, &stubHasher{}, discardRecorder)
 
-		result, err := uc.Verify(3, "right-code")
+		result, err := uc.Verify(testCtx, 3, "right-code")
 
 		if err != nil {
 			t.Fatalf("expected no error, got %v", err)

test/activity_domain_test.go

@@ -0,0 +1,199 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/user"
+	"errors"
+	"reflect"
+	"sort"
+	"testing"
+	"time"
+)
+
+func activityStrings[T ~string](values []T) []string {
+	result := make([]string, 0, len(values))
+	for _, value := range values {
+		result = append(result, string(value))
+	}
+	sort.Strings(result)
+	return result
+}
+
+func TestActivityDomain(t *testing.T) {
+	t.Run("An event carries everything the log needs", func(t *testing.T) {
+		event := audit.NewEvent("article.publish", audit.CategoryArticles)
+
+		if event.Action != "article.publish" || event.Category != audit.CategoryArticles {
+			t.Fatalf("unexpected action or category: %+v", event)
+		}
+		if event.Outcome != audit.OutcomeSuccess {
+			t.Errorf("expected a successful outcome by default, got %q", event.Outcome)
+		}
+		wanted := []string{"ID", "CreatedAt", "Action", "Params", "Category", "Actor", "Target", "Outcome", "FailureReason", "Security", "Source", "IP", "UserAgent", "Changes"}
+		eventType := reflect.TypeOf(event)
+		for _, name := range wanted {
+			if _, ok := eventType.FieldByName(name); !ok {
+				t.Errorf("the event has no %s field", name)
+			}
+		}
+		actorType := reflect.TypeOf(event.Actor)
+		for _, name := range []string{"Type", "ID", "Name"} {
+			if _, ok := actorType.FieldByName(name); !ok {
+				t.Errorf("the actor snapshot has no %s field", name)
+			}
+		}
+		targetType := reflect.TypeOf(event.Target)
+		for _, name := range []string{"Type", "ID", "Name"} {
+			if _, ok := targetType.FieldByName(name); !ok {
+				t.Errorf("the target snapshot has no %s field", name)
+			}
+		}
+	})
+
+	vocabulary := []struct {
+		field  string
+		got    []string
+		wanted []string
+	}{
+		{"actor.type", activityStrings(audit.ActorTypes()), []string{"anonymous", "api_key", "system", "user"}},
+		{"category", activityStrings(audit.Categories()), []string{"api_keys", "articles", "auth", "media", "system", "users"}},
+		{"outcome", activityStrings(audit.Outcomes()), []string{"failed", "success"}},
+		{"source", activityStrings(audit.Sources()), []string{"api_key", "system", "web"}},
+		{"change.kind", activityStrings(audit.ChangeKinds()), []string{"body", "text"}},
+	}
+	for _, c := range vocabulary {
+		t.Run("The vocabulary is closed: "+c.field, func(t *testing.T) {
+			if !reflect.DeepEqual(c.got, c.wanted) {
+				t.Errorf("expected %v, got %v", c.wanted, c.got)
+			}
+		})
+	}
+
+	t.Run("The repository exposes no way to edit or delete one event", func(t *testing.T) {
+		repoType := reflect.TypeOf((*audit.Repository)(nil)).Elem()
+		var names []string
+		for i := 0; i < repoType.NumMethod(); i++ {
+			names = append(names, repoType.Method(i).Name)
+		}
+		sort.Strings(names)
+		wanted := []string{"Append", "DeleteOlderThan", "List", "Summary"}
+		if !reflect.DeepEqual(names, wanted) {
+			t.Errorf("expected methods %v, got %v", wanted, names)
+		}
+	})
+
+	t.Run("The sentinel errors are matchable", func(t *testing.T) {
+		if !errors.Is(audit.ErrInvalidFilter, audit.ErrInvalidFilter) || !errors.Is(audit.ErrInvalidRetention, audit.ErrInvalidRetention) {
+			t.Fatal("sentinels must match themselves")
+		}
+		if errors.Is(audit.ErrInvalidFilter, audit.ErrInvalidRetention) {
+			t.Error("the sentinels must be distinct")
+		}
+		if _, err := audit.ParseActor("group:3"); !errors.Is(err, audit.ErrInvalidFilter) {
+			t.Errorf("expected ErrInvalidFilter, got %v", err)
+		}
+		if err := audit.ValidateRetentionDays(7); !errors.Is(err, audit.ErrInvalidRetention) {
+			t.Errorf("expected ErrInvalidRetention, got %v", err)
+		}
+	})
+
+	t.Run("An actor reference is parsed from its query form", func(t *testing.T) {
+		cases := []struct {
+			raw      string
+			wantType audit.ActorType
+			wantID   uint32
+			wantErr  bool
+		}{
+			{"user:3", audit.ActorUser, 3, false},
+			{"key:7", audit.ActorAPIKey, 7, false},
+			{"system", audit.ActorSystem, 0, false},
+			{"user:abc", "", 0, true},
+			{"user:-1", "", 0, true},
+			{"user:", "", 0, true},
+			{"group:3", "", 0, true},
+			{"system:1", "", 0, true},
+		}
+		for _, c := range cases {
+			ref, err := audit.ParseActor(c.raw)
+			if c.wantErr {
+				if !errors.Is(err, audit.ErrInvalidFilter) {
+					t.Errorf("%q: expected ErrInvalidFilter, got %v", c.raw, err)
+				}
+				continue
+			}
+			if err != nil || ref.Type != c.wantType {
+				t.Fatalf("%q: unexpected result %+v, %v", c.raw, ref, err)
+			}
+			if c.wantID != 0 && (ref.ID == nil || *ref.ID != c.wantID) {
+				t.Errorf("%q: expected id %d, got %v", c.raw, c.wantID, ref.ID)
+			}
+		}
+	})
+
+	t.Run("A user actor reads the display name and falls back to the username", func(t *testing.T) {
+		named := audit.UserActor(user.User{ID: 3, Username: "marta", DisplayName: "Marta Alves"})
+		if named.Type != audit.ActorUser || named.ID == nil || *named.ID != 3 || named.Name != "Marta Alves" {
+			t.Errorf("unexpected actor %+v", named)
+		}
+		plain := audit.UserActor(user.User{ID: 4, Username: "dev"})
+		if plain.Name != "dev" {
+			t.Errorf("expected the username, got %q", plain.Name)
+		}
+	})
+
+	t.Run("Only the documented retention periods are valid", func(t *testing.T) {
+		for _, days := range []int{30, 90, 365, 0} {
+			if err := audit.ValidateRetentionDays(days); err != nil {
+				t.Errorf("%d should be valid: %v", days, err)
+			}
+		}
+		for _, days := range []int{7, -1, 366, 1} {
+			if err := audit.ValidateRetentionDays(days); !errors.Is(err, audit.ErrInvalidRetention) {
+				t.Errorf("%d should be invalid, got %v", days, err)
+			}
+		}
+		if audit.DefaultSettings().RetentionDays != 90 {
+			t.Errorf("the default retention must be 90 days")
+		}
+	})
+
+	t.Run("The cleanup is due once a day at or after 03:00", func(t *testing.T) {
+		at := func(day, hour, minute int) time.Time {
+			return time.Date(2026, time.October, day, hour, minute, 0, 0, time.UTC)
+		}
+		cases := []struct {
+			name string
+			last *time.Time
+			now  time.Time
+			due  bool
+		}{
+			{"never before 03:00", nil, at(6, 2, 59), false},
+			{"never at 03:00", nil, at(6, 3, 0), true},
+			{"never at 14:00", nil, at(6, 14, 0), true},
+			{"yesterday before 03:00", ptrTime(at(5, 3, 0)), at(6, 2, 59), false},
+			{"yesterday at 03:00", ptrTime(at(5, 3, 0)), at(6, 3, 0), true},
+			{"today already", ptrTime(at(6, 3, 0)), at(6, 4, 0), false},
+			{"tomorrow at 03:00", ptrTime(at(6, 3, 0)), at(7, 3, 0), true},
+		}
+		for _, c := range cases {
+			settings := audit.Settings{RetentionDays: 90, LastCleanupAt: c.last}
+			if got := settings.CleanupDue(c.now); got != c.due {
+				t.Errorf("%s: expected %v, got %v", c.name, c.due, got)
+			}
+		}
+	})
+
+	t.Run("The last 24 hours are never removed", func(t *testing.T) {
+		now := time.Date(2026, time.October, 6, 3, 0, 0, 0, time.UTC)
+		tooRecent := now.Add(-time.Hour)
+		if got := audit.ClampCutoff(now, tooRecent); !got.Equal(now.Add(-24 * time.Hour)) {
+			t.Errorf("expected the 24 hour floor, got %v", got)
+		}
+		older := now.Add(-48 * time.Hour)
+		if got := audit.ClampCutoff(now, older); !got.Equal(older) {
+			t.Errorf("expected the older cutoff to stay, got %v", got)
+		}
+	})
+}
+
+func ptrTime(t time.Time) *time.Time { return &t }

test/activity_log_backend_qa_test.go

@@ -0,0 +1,173 @@
+package test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func TestActivityLogBackendQAResetResponseIsIndistinguishable(t *testing.T) {
+	t.Run("unknown email answers the same bytes as an existing account", func(t *testing.T) {
+		e := newActivityHTTPEnv(t, 1000)
+
+		known := e.send(http.MethodPost, "/v1/auth/password-reset", `{"email":"marta@example.com"}`)
+		unknown := e.send(http.MethodPost, "/v1/auth/password-reset", `{"email":"nobody@example.com"}`)
+
+		if known.Code != unknown.Code || known.Body.String() != unknown.Body.String() {
+			t.Errorf("responses differ: %d %q versus %d %q", known.Code, known.Body.String(), unknown.Code, unknown.Body.String())
+		}
+	})
+}
+
+func TestActivityLogBackendQAProducersSurviveRecorderFailure(t *testing.T) {
+	type producer func(e *activityHTTPEnv) *httptest.ResponseRecorder
+	producers := map[string]producer{
+		"login failure": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			return e.send(http.MethodPost, "/v1/auth/login", `{"username":"marta","password":"wrongpassword1"}`)
+		},
+		"logout": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			return e.send(http.MethodPost, "/v1/auth/logout", "", asUser(e, activityOwnerID))
+		},
+		"password reset request": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			return e.send(http.MethodPost, "/v1/auth/password-reset", `{"email":"marta@example.com"}`)
+		},
+		"api key creation": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			return e.send(http.MethodPost, "/v1/api-key", `{"name":"Deploy bot"}`, asUser(e, activityOwnerID))
+		},
+		"api key revoke": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			_, id := e.issueKey(t, activityOwnerID, "Deploy bot")
+			return e.send(http.MethodDelete, "/v1/api-key/"+strconv.Itoa(int(id)), "", asUser(e, activityOwnerID))
+		},
+		"retention change": func(e *activityHTTPEnv) *httptest.ResponseRecorder {
+			return e.send(http.MethodPatch, "/v1/settings", `{"activity_retention_days": 30}`, asUser(e, activityOwnerID))
+		},
+	}
+	scrub := regexp.MustCompile(`"(id|key|prefix|created_at)":\s*("[^"]*"|[0-9]+)`)
+	for name, run := range producers {
+		t.Run(name, func(t *testing.T) {
+			healthy := run(newActivityHTTPEnv(t, 1000))
+			broken := newActivityHTTPEnv(t, 1000)
+			broken.probe.appendErr = errDiskFull
+
+			got := run(broken)
+
+			if got.Code != healthy.Code || scrub.ReplaceAllString(got.Body.String(), "") != scrub.ReplaceAllString(healthy.Body.String(), "") {
+				t.Errorf("a failing recorder changed the answer: %d %q versus %d %q", got.Code, got.Body.String(), healthy.Code, healthy.Body.String())
+			}
+		})
+	}
+}
+
+func TestActivityLogBackendQAGuards(t *testing.T) {
+	read := func(t *testing.T, root string, suffix string) map[string]string {
+		t.Helper()
+		files := map[string]string{}
+		err := filepath.Walk(filepath.Join("..", root), func(path string, info os.FileInfo, err error) error {
+			if err != nil || info.IsDir() || !strings.HasSuffix(path, suffix) {
+				return err
+			}
+			content, readErr := os.ReadFile(path)
+			files[path] = string(content)
+			return readErr
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(files) == 0 {
+			t.Fatalf("no files under %s", root)
+		}
+		return files
+	}
+
+	t.Run("The audit repository source uses no dialect specific SQL", func(t *testing.T) {
+		for path, source := range read(t, "internal/infrastructure/persistence/repositories", ".go") {
+			if !strings.Contains(filepath.Base(path), "audit") {
+				continue
+			}
+			for _, banned := range []string{"ILIKE", "strftime", "date_trunc"} {
+				if strings.Contains(source, banned) {
+					t.Errorf("%s contains %s", path, banned)
+				}
+			}
+		}
+	})
+
+	t.Run("The audit domain imports only the stdlib and domain packages", func(t *testing.T) {
+		importLine := regexp.MustCompile(`(?m)^\s*"([^"]+)"$`)
+		for path, source := range read(t, "internal/domain/audit", ".go") {
+			for _, match := range importLine.FindAllStringSubmatch(source, -1) {
+				if strings.Contains(match[1], ".") && !strings.HasPrefix(match[1], "RenewCMS/internal/domain/") {
+					t.Errorf("%s imports %s", path, match[1])
+				}
+				if strings.HasPrefix(match[1], "RenewCMS/") && !strings.HasPrefix(match[1], "RenewCMS/internal/domain/") {
+					t.Errorf("%s imports %s", path, match[1])
+				}
+			}
+		}
+	})
+
+	t.Run("The activity use cases and handlers keep their layering", func(t *testing.T) {
+		banned := []string{"gorm.io", "infrastructure/persistence", "infrastructure/mailer", "net/http", "go-chi", "RenewCMS/api"}
+		for path, source := range read(t, "internal/infrastructure/useCases", ".go") {
+			base := filepath.Base(path)
+			if !strings.Contains(base, "Activity") && !strings.Contains(base, "activity") {
+				continue
+			}
+			for _, word := range banned {
+				if strings.Contains(source, word+`"`) || strings.Contains(source, `"`+word) {
+					t.Errorf("%s imports %s", path, word)
+				}
+			}
+		}
+		for path, source := range read(t, "api/handlers/activity", ".go") {
+			for _, word := range []string{"gorm.io", "persistence", "infrastructure/mailer"} {
+				if strings.Contains(source, word) {
+					t.Errorf("%s references %s", path, word)
+				}
+			}
+		}
+	})
+
+	t.Run("The persistence repository asserts the audit contract", func(t *testing.T) {
+		for path, source := range read(t, "internal/infrastructure/persistence/repositories", "auditEventRepository.go") {
+			if !strings.Contains(source, "var _ audit.Repository = &") {
+				t.Errorf("%s lacks the interface assertion", path)
+			}
+		}
+	})
+
+	t.Run("The new Go files hold no comment", func(t *testing.T) {
+		line := regexp.MustCompile(`(?m)^\s*//`)
+		for _, root := range []string{"internal/domain/audit", "internal/infrastructure/auditing", "api/handlers/activity"} {
+			for path, source := range read(t, root, ".go") {
+				if line.MatchString(source) {
+					t.Errorf("%s holds a comment", path)
+				}
+			}
+		}
+	})
+
+	t.Run("The docs describe the activity surface", func(t *testing.T) {
+		wants := map[string][]string{
+			"docs/api.md":           {"/v1/activity", "/v1/activity/summary", "/v1/activity/export", "activity_retention_days"},
+			"docs/architecture.md":  {"audit"},
+			"docs/configuration.md": {"retention"},
+		}
+		for doc, needles := range wants {
+			content, err := os.ReadFile(filepath.Join("..", doc))
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, needle := range needles {
+				if !strings.Contains(string(content), needle) {
+					t.Errorf("%s does not mention %s", doc, needle)
+				}
+			}
+		}
+	})
+}

test/activity_log_producers_http_test.go

@@ -0,0 +1,943 @@
+package test
+
+import (
+	"RenewCMS/api"
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/update"
+	"RenewCMS/internal/infrastructure/useCases"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"regexp"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+)
+
+var producersTimestamps = regexp.MustCompile(`"(created_at|expires_at)":"[^"]*",?`)
+
+const (
+	producersUserAgent  = "producers-test/1.0"
+	producersClientIP   = "192.0.2.1"
+	producersOwnerName  = "Marta Alves"
+	producersSpringName = "Spring release"
+	producersBannerPath = "/static/uploadedImages/"
+)
+
+type producersEnv struct {
+	*apiKeyEnv
+	audit *activityHarness
+}
+
+func newProducersEnv(t *testing.T) *producersEnv {
+	t.Helper()
+	h := newActivityHarness(t)
+	env := newAPIKeyEnvRecording(t, h.recorder)
+	owner := env.users.users[apiKeyOwnerId]
+	owner.DisplayName = producersOwnerName
+	env.users.users[apiKeyOwnerId] = owner
+	env.container.ListActivityUseCase = useCases.NewListActivityUseCase(h.store, env.users, env.articles, env.images, env.keys, h.clock)
+	router := chi.NewRouter()
+	router.Mount("/v1", api.InitBackendRoutes(env.container, env.settings))
+	env.router = router
+	return &producersEnv{apiKeyEnv: env, audit: h}
+}
+
+func (p *producersEnv) request(t *testing.T, req *http.Request, userId uint32) *httptest.ResponseRecorder {
+	t.Helper()
+	req.Header.Set("User-Agent", producersUserAgent)
+	if userId != 0 {
+		req.AddCookie(p.cookie(t, userId, 0))
+	}
+	rec := httptest.NewRecorder()
+	p.router.ServeHTTP(rec, req)
+	return rec
+}
+
+func (p *producersEnv) as(t *testing.T, userId uint32, method string, path string, body string) *httptest.ResponseRecorder {
+	t.Helper()
+	req := httptest.NewRequest(method, path, strings.NewReader(body))
+	if body != "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	return p.request(t, req, userId)
+}
+
+func (p *producersEnv) asKey(t *testing.T, raw string, method string, path string, body string) *httptest.ResponseRecorder {
+	t.Helper()
+	req := httptest.NewRequest(method, path, strings.NewReader(body))
+	if body != "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	req.Header.Set("Authorization", "Bearer "+raw)
+	return p.request(t, req, 0)
+}
+
+func (p *producersEnv) upload(t *testing.T, userId uint32, filename string, contentType string, content []byte) *httptest.ResponseRecorder {
+	t.Helper()
+	return p.request(t, newMultipartFileRequest(t, http.MethodPost, "/v1/media", filename, contentType, content), userId)
+}
+
+func (p *producersEnv) events(t *testing.T) []audit.Event {
+	t.Helper()
+	return p.audit.all(t)
+}
+
+func (p *producersEnv) single(t *testing.T) audit.Event {
+	t.Helper()
+	events := p.events(t)
+	if len(events) != 1 {
+		t.Fatalf("expected exactly one event, got %d: %+v", len(events), events)
+	}
+	return events[0]
+}
+
+func (p *producersEnv) noEvent(t *testing.T) {
+	t.Helper()
+	if events := p.events(t); len(events) != 0 {
+		t.Fatalf("expected no event, got %d: %+v", len(events), events)
+	}
+}
+
+func (p *producersEnv) seedSpring(id uint32, body string, online bool) {
+	p.articles.articles[id] = article.Article{ID: id, Title: producersSpringName, Body: body, IsOnline: online}
+}
+
+func (p *producersEnv) seedBanner(id uint32, filename string, hash string) {
+	p.images.images[id] = image.Image{ID: id, Filename: filename, ContentType: "image/png", Path: producersBannerPath + strconv.Itoa(int(id)) + ".png", SHA256: hash, UploadedByID: apiKeyOwnerId}
+}
+
+func (p *producersEnv) seedPendingInvite(email string) invite.Invite {
+	return p.invites.seed(invite.Invite{Email: email, HashedCode: "hashed:code", ExpiresAt: time.Now().Add(24 * time.Hour), InvitedBy: apiKeyOwnerId, CreatedAt: time.Now()})
+}
+
+func paramsJSON(t *testing.T, event audit.Event) string {
+	t.Helper()
+	encoded, err := json.Marshal(event.Params)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(encoded)
+}
+
+func changesJSON(t *testing.T, event audit.Event) string {
+	t.Helper()
+	encoded, err := json.Marshal(event.Changes)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(encoded)
+}
+
+func assertProducerEvent(t *testing.T, event audit.Event, action string, category audit.Category, outcome audit.Outcome) {
+	t.Helper()
+	if event.Action != action || event.Category != category || event.Outcome != outcome {
+		t.Fatalf("event = %s/%s/%s, expected %s/%s/%s", event.Action, event.Category, event.Outcome, action, category, outcome)
+	}
+}
+
+func assertProducerTarget(t *testing.T, event audit.Event, targetType string, id string, name string) {
+	t.Helper()
+	if event.Target != (audit.Target{Type: targetType, ID: id, Name: name}) {
+		t.Errorf("target = %+v, expected {%s %s %s}", event.Target, targetType, id, name)
+	}
+}
+
+func assertProducerFailure(t *testing.T, event audit.Event, reason string) {
+	t.Helper()
+	if event.Outcome != audit.OutcomeFailed || event.FailureReason == nil || *event.FailureReason != reason {
+		t.Errorf("outcome = %s, failure_reason = %v, expected failed with %q", event.Outcome, event.FailureReason, reason)
+	}
+}
+
+func assertProducerOwnerOrigin(t *testing.T, event audit.Event) {
+	t.Helper()
+	if event.Actor.Type != audit.ActorUser || event.Actor.ID == nil || *event.Actor.ID != apiKeyOwnerId || event.Actor.Name != producersOwnerName {
+		t.Errorf("actor = %+v", event.Actor)
+	}
+	if event.Source != audit.SourceWeb {
+		t.Errorf("source = %s", event.Source)
+	}
+	if event.IP == nil || *event.IP != producersClientIP || event.UserAgent == nil || *event.UserAgent != producersUserAgent {
+		t.Errorf("ip = %v, user agent = %v", event.IP, event.UserAgent)
+	}
+}
+
+func TestActivityLogProducersRouteContext(t *testing.T) {
+	t.Run("A producing route carries the origin of the request", func(t *testing.T) {
+		t.Run("POST /v1/article with the owner's jwt cookie", func(t *testing.T) {
+			p := newProducersEnv(t)
+			rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`)
+			assertAPIKeyStatus(t, rec, http.StatusCreated)
+			assertProducerOwnerOrigin(t, p.single(t))
+		})
+
+		t.Run("POST /v1/article with an API key Deploy bot", func(t *testing.T) {
+			p := newProducersEnv(t)
+			raw, keyId := p.issueKey(apiKeyDevId, "Deploy bot")
+			rec := p.asKey(t, raw, http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`)
+			assertAPIKeyStatus(t, rec, http.StatusCreated)
+			event := p.single(t)
+			if event.Actor.Type != audit.ActorAPIKey || event.Actor.ID == nil || *event.Actor.ID != keyId || event.Actor.Name != "Deploy bot" || event.Source != audit.SourceAPIKey {
+				t.Errorf("actor = %+v, source = %s", event.Actor, event.Source)
+			}
+			if event.IP == nil || *event.IP != producersClientIP || event.UserAgent == nil || *event.UserAgent != producersUserAgent {
+				t.Errorf("ip = %v, user agent = %v", event.IP, event.UserAgent)
+			}
+		})
+
+		t.Run("POST /v1/media with an API key Deploy bot", func(t *testing.T) {
+			p := newProducersEnv(t)
+			raw, keyId := p.issueKey(apiKeyDevId, "Deploy bot")
+			req := newMultipartFileRequest(t, http.MethodPost, "/v1/media", "spring-banner.png", "image/png", pngBytes(t, 3, 2))
+			req.Header.Set("Authorization", "Bearer "+raw)
+			rec := p.request(t, req, 0)
+			assertAPIKeyStatus(t, rec, http.StatusCreated)
+			event := p.single(t)
+			if event.Actor.Type != audit.ActorAPIKey || event.Actor.ID == nil || *event.Actor.ID != keyId || event.Actor.Name != "Deploy bot" || event.Source != audit.SourceAPIKey {
+				t.Errorf("actor = %+v, source = %s", event.Actor, event.Source)
+			}
+		})
+
+		t.Run("POST /v1/system/update/check with the owner's jwt cookie", func(t *testing.T) {
+			p := newProducersEnv(t)
+			rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/check", "")
+			assertAPIKeyStatus(t, rec, http.StatusOK)
+			assertProducerOwnerOrigin(t, p.single(t))
+		})
+	})
+}
+
+func TestActivityLogProducersFailedAuditWrite(t *testing.T) {
+	type row struct {
+		name    string
+		panics  bool
+		setup   func(p *producersEnv)
+		send    func(t *testing.T, p *producersEnv) *httptest.ResponseRecorder
+		applied func(t *testing.T, p *producersEnv)
+	}
+	owner := func(method string, path string, body string) func(t *testing.T, p *producersEnv) *httptest.ResponseRecorder {
+		return func(t *testing.T, p *producersEnv) *httptest.ResponseRecorder {
+			return p.as(t, apiKeyOwnerId, method, path, body)
+		}
+	}
+	seedArticle := func(p *producersEnv) { p.seedSpring(8, "Hello", false) }
+	seedCopies := func(p *producersEnv) {
+		p.seedBanner(5, "banner.png", "same")
+		p.seedBanner(6, "banner-copy.png", "same")
+		p.articles.articles[1] = article.Article{ID: 1, Title: "Uses copy", Body: "see 6.png"}
+	}
+	rows := []row{
+		{name: "fails POST /v1/article", setup: func(*producersEnv) {}, send: owner(http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`), applied: func(t *testing.T, p *producersEnv) {
+			if len(p.articles.articles) != 1 {
+				t.Errorf("the article was not created")
+			}
+		}},
+		{name: "fails DELETE /v1/article/8", setup: seedArticle, send: owner(http.MethodDelete, "/v1/article/8", ""), applied: func(t *testing.T, p *producersEnv) {
+			if _, found := p.articles.articles[8]; found {
+				t.Errorf("the article was not deleted")
+			}
+		}},
+		{name: "panics PATCH /v1/article/8/publish", panics: true, setup: seedArticle, send: owner(http.MethodPatch, "/v1/article/8/publish", ""), applied: func(t *testing.T, p *producersEnv) {
+			if !p.articles.articles[8].IsOnline {
+				t.Errorf("the article was not published")
+			}
+		}},
+		{name: "fails POST /v1/media", setup: func(*producersEnv) {}, send: func(t *testing.T, p *producersEnv) *httptest.ResponseRecorder {
+			return p.upload(t, apiKeyOwnerId, "spring-banner.png", "image/png", pngBytes(t, 3, 2))
+		}, applied: func(t *testing.T, p *producersEnv) {
+			if len(p.images.images) != 1 {
+				t.Errorf("the image was not stored")
+			}
+		}},
+		{name: "fails POST /v1/media/merge", setup: seedCopies, send: owner(http.MethodPost, "/v1/media/merge", `{"keep_id":5,"merge_ids":[6]}`), applied: func(t *testing.T, p *producersEnv) {
+			if _, found := p.images.images[6]; found {
+				t.Errorf("the copy was not merged")
+			}
+		}},
+		{name: "fails POST /v1/user/invite", setup: func(*producersEnv) {}, send: owner(http.MethodPost, "/v1/user/invite", `{"email":"new@example.com"}`), applied: func(t *testing.T, p *producersEnv) {
+			if len(p.invites.invites) != 1 {
+				t.Errorf("the invite was not created")
+			}
+		}},
+		{name: "fails POST /v1/system/update/restart", setup: func(*producersEnv) {}, send: owner(http.MethodPost, "/v1/system/update/restart", ""), applied: func(*testing.T, *producersEnv) {}},
+	}
+
+	t.Run("A failing or panicking repository leaves the response untouched", func(t *testing.T) {
+		for _, example := range rows {
+			t.Run(example.name, func(t *testing.T) {
+				healthy := newProducersEnv(t)
+				example.setup(healthy)
+				expected := example.send(t, healthy)
+
+				p := newProducersEnv(t)
+				example.setup(p)
+				if example.panics {
+					p.audit.probe.appendPanic = true
+				} else {
+					p.audit.probe.appendErr = errDiskFull
+				}
+				rec := example.send(t, p)
+
+				if rec.Code != expected.Code || producersTimestamps.ReplaceAllString(rec.Body.String(), "") != producersTimestamps.ReplaceAllString(expected.Body.String(), "") {
+					t.Errorf("response = %d %q, healthy response = %d %q", rec.Code, rec.Body.String(), expected.Code, expected.Body.String())
+				}
+				if rec.Code >= http.StatusBadRequest {
+					t.Fatalf("the request was expected to succeed, got %d: %s", rec.Code, rec.Body.String())
+				}
+				example.applied(t, p)
+				if !strings.Contains(p.audit.logs.String(), "audit:") {
+					t.Errorf("the process log does not name the failed audit write: %q", p.audit.logs.String())
+				}
+			})
+		}
+	})
+}
+
+func TestActivityLogProducersArticles(t *testing.T) {
+	t.Run("Creating an article is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`)
+		assertAPIKeyStatus(t, rec, http.StatusCreated)
+		event := p.single(t)
+		assertProducerEvent(t, event, "article.create", audit.CategoryArticles, audit.OutcomeSuccess)
+		assertProducerOwnerOrigin(t, event)
+		assertProducerTarget(t, event, "article", "1", producersSpringName)
+		if event.FailureReason != nil || len(event.Changes) != 0 {
+			t.Errorf("failure reason = %v, changes = %+v", event.FailureReason, event.Changes)
+		}
+		if encoded, _ := json.Marshal(event); strings.Contains(string(encoded), "Hello") {
+			t.Errorf("the stored event holds the article body: %s", encoded)
+		}
+	})
+
+	t.Run("Editing the body records a size delta and never the text", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, strings.Repeat("a", 100), false)
+		newBody := strings.Repeat("secretbody", 41) + "xx"
+		rec := p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8", `{"body":"`+newBody+`"}`)
+		assertAPIKeyStatus(t, rec, http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "article.edit", audit.CategoryArticles, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "article", "8", producersSpringName)
+		if got := changesJSON(t, event); got != `[{"field":"body","kind":"body","delta":312}]` {
+			t.Errorf("changes = %s", got)
+		}
+		listing := p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/activity", "")
+		assertAPIKeyStatus(t, listing, http.StatusOK)
+		if strings.Contains(listing.Body.String(), "secretbody") || strings.Contains(listing.Body.String(), "aaaa") {
+			t.Errorf("the activity response holds article text: %s", listing.Body.String())
+		}
+	})
+
+	t.Run("Saving an identical body records nothing", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, "Same text", false)
+		rec := p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8", `{"body":"Same text"}`)
+		assertAPIKeyStatus(t, rec, http.StatusOK)
+		p.noEvent(t)
+	})
+
+	t.Run("Publishing is recorded with the publish state", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, "Hello", false)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8/publish", ""), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "article.publish", audit.CategoryArticles, audit.OutcomeSuccess)
+		if got := changesJSON(t, event); got != `[{"field":"online","kind":"text","before":"false","after":"true"}]` {
+			t.Errorf("changes = %s", got)
+		}
+	})
+
+	t.Run("Unpublishing is recorded with the publish state", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, "Hello", true)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8/unpublish", ""), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "article.unpublish", audit.CategoryArticles, audit.OutcomeSuccess)
+		if got := changesJSON(t, event); got != `[{"field":"online","kind":"text","before":"true","after":"false"}]` {
+			t.Errorf("changes = %s", got)
+		}
+	})
+
+	t.Run("A publish state that does not change records nothing", func(t *testing.T) {
+		for _, example := range []struct {
+			state  bool
+			path   string
+			status int
+		}{{true, "publish", http.StatusOK}, {false, "unpublish", http.StatusOK}} {
+			t.Run(strconv.FormatBool(example.state)+" "+example.path, func(t *testing.T) {
+				p := newProducersEnv(t)
+				p.seedSpring(8, "Hello", example.state)
+				assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8/"+example.path, ""), example.status)
+				p.noEvent(t)
+			})
+		}
+	})
+
+	t.Run("Deleting an article is recorded with its name snapshot", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, "Hello", false)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/article/8", ""), http.StatusNoContent)
+		event := p.single(t)
+		assertProducerEvent(t, event, "article.delete", audit.CategoryArticles, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "article", "8", producersSpringName)
+
+		listing := p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/activity", "")
+		var page struct {
+			Items []struct {
+				Target struct {
+					Exists bool `json:"exists"`
+				} `json:"target"`
+			} `json:"items"`
+		}
+		if err := json.Unmarshal(listing.Body.Bytes(), &page); err != nil || len(page.Items) != 1 || page.Items[0].Target.Exists {
+			t.Errorf("listing = %s, err = %v", listing.Body.String(), err)
+		}
+	})
+
+	t.Run("A refused article action is recorded as failed with a plain reason", func(t *testing.T) {
+		t.Run("the repository fails with db is locked on create", func(t *testing.T) {
+			p := newProducersEnv(t)
+			p.articles.fail.failNextWith("Create", errors.New("db is locked"))
+			rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`)
+			assertAPIKeyStatus(t, rec, http.StatusInternalServerError)
+			event := p.single(t)
+			assertProducerEvent(t, event, "article.create", audit.CategoryArticles, audit.OutcomeFailed)
+			assertProducerFailure(t, event, useCases.GenericFailureReason)
+			if strings.Contains(paramsJSON(t, event), "locked") || strings.Contains(*event.FailureReason, "locked") {
+				t.Errorf("the raw error leaked: %+v", event)
+			}
+		})
+
+		t.Run("the repository fails with db is locked on publish", func(t *testing.T) {
+			p := newProducersEnv(t)
+			p.seedSpring(8, "Hello", false)
+			p.articles.fail.failNextWith("UpdateIsOnline", errors.New("db is locked"))
+			assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/8/publish", ""), http.StatusInternalServerError)
+			event := p.single(t)
+			assertProducerEvent(t, event, "article.publish", audit.CategoryArticles, audit.OutcomeFailed)
+			assertProducerFailure(t, event, useCases.GenericFailureReason)
+			assertProducerTarget(t, event, "article", "8", producersSpringName)
+		})
+	})
+
+	t.Run("An article that does not exist records nothing", func(t *testing.T) {
+		p := newProducersEnv(t)
+		for _, call := range []struct{ method, path, body string }{
+			{http.MethodDelete, "/v1/article/99", ""},
+			{http.MethodPatch, "/v1/article/99", `{"body":"x"}`},
+			{http.MethodPatch, "/v1/article/99/publish", ""},
+			{http.MethodPatch, "/v1/article/99/unpublish", ""},
+		} {
+			assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, call.method, call.path, call.body), http.StatusNotFound)
+		}
+		p.noEvent(t)
+	})
+
+	t.Run("A request that fails validation records nothing", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/article", `{}`), http.StatusBadRequest)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/abc", `{"body":"x"}`), http.StatusBadRequest)
+		p.noEvent(t)
+	})
+
+	t.Run("Reads are never recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedSpring(8, "Hello", true)
+		for _, path := range []string{"/v1/article", "/v1/article/8"} {
+			assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodGet, path, ""), http.StatusOK)
+		}
+		assertAPIKeyStatus(t, p.as(t, 0, http.MethodGet, "/v1/article/8", ""), http.StatusOK)
+		p.noEvent(t)
+	})
+}
+
+func TestActivityLogProducersMedia(t *testing.T) {
+	t.Run("Uploading an image is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.upload(t, apiKeyOwnerId, "spring-banner.png", "image/png", pngBytes(t, 3, 2)), http.StatusCreated)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.upload", audit.CategoryMedia, audit.OutcomeSuccess)
+		assertProducerOwnerOrigin(t, event)
+		assertProducerTarget(t, event, "image", "1", "spring-banner.png")
+		if encoded, _ := json.Marshal(event); strings.Contains(string(encoded), "/static/") {
+			t.Errorf("the stored event holds a storage path: %s", encoded)
+		}
+	})
+
+	t.Run("A refused upload is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name        string
+			contentType string
+			content     func(t *testing.T) []byte
+			reason      string
+		}{
+			{"a GIF", "image/gif", func(t *testing.T) []byte { return []byte("GIF89a") }, "The file must be a PNG, JPEG, WEBP or SVG image."},
+			{"a PNG larger than the limit", "image/png", func(t *testing.T) []byte { return paddedPngBytes(t, int(image.MaxImageSize)+10) }, "The file is too large to upload."},
+			{"a corrupt PNG", "image/png", func(t *testing.T) []byte { return []byte("not a png") }, "The image could not be read."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				p := newProducersEnv(t)
+				rec := p.upload(t, apiKeyOwnerId, "spring-banner.png", example.contentType, example.content(t))
+				if rec.Code < http.StatusBadRequest {
+					t.Fatalf("expected a refusal, got %d", rec.Code)
+				}
+				event := p.single(t)
+				assertProducerEvent(t, event, "media.upload", audit.CategoryMedia, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+				if event.Target.Name != "spring-banner.png" {
+					t.Errorf("target = %+v", event.Target)
+				}
+			})
+		}
+	})
+
+	t.Run("Renaming an image records the filename diff", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "h")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/media/5", `{"filename":"spring-banner"}`), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.rename", audit.CategoryMedia, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "image", "5", "spring-banner.png")
+		if got := changesJSON(t, event); got != `[{"field":"filename","kind":"text","before":"banner.png","after":"spring-banner.png"}]` {
+			t.Errorf("changes = %s", got)
+		}
+	})
+
+	t.Run("Renaming to the same name records nothing", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "h")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/media/5", `{"filename":"banner"}`), http.StatusOK)
+		p.noEvent(t)
+	})
+
+	t.Run("A refused rename is recorded as failed", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "h")
+		rec := p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/media/5", `{"filename":"not/valid"}`)
+		assertAPIKeyStatus(t, rec, http.StatusBadRequest)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.rename", audit.CategoryMedia, audit.OutcomeFailed)
+		assertProducerFailure(t, event, "That file name is not valid.")
+		assertProducerTarget(t, event, "image", "5", "banner.png")
+	})
+
+	t.Run("Deleting an image is recorded with its name snapshot", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "h")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/media/5", ""), http.StatusNoContent)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.delete", audit.CategoryMedia, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "image", "5", "banner.png")
+	})
+
+	t.Run("Merging images is recorded once with its counts", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "same")
+		p.seedBanner(6, "banner-copy.png", "same")
+		p.seedBanner(7, "banner-copy-2.png", "same")
+		p.articles.articles[1] = article.Article{ID: 1, Title: "One", Body: "see 6.png"}
+		p.articles.articles[2] = article.Article{ID: 2, Title: "Two", Body: "see 7.png"}
+		rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/merge", `{"keep_id":5,"merge_ids":[6,7]}`)
+		assertAPIKeyStatus(t, rec, http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.merge", audit.CategoryMedia, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "image", "5", "banner.png")
+		if got := paramsJSON(t, event); got != `{"articles_updated":2,"merged":2}` {
+			t.Errorf("params = %s", got)
+		}
+	})
+
+	t.Run("A refused merge is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name   string
+			setup  func(p *producersEnv)
+			body   string
+			reason string
+		}{
+			{"ErrInvalidMergeRequest", func(p *producersEnv) { p.seedBanner(5, "banner.png", "same") }, `{"keep_id":5,"merge_ids":[5]}`, "The merge request is not valid."},
+			{"ErrMergeCopyMissing", func(p *producersEnv) { p.seedBanner(5, "banner.png", "same") }, `{"keep_id":5,"merge_ids":[6]}`, "One of the copies no longer exists."},
+			{"ErrMergeHashMismatch", func(p *producersEnv) {
+				p.seedBanner(5, "banner.png", "same")
+				p.seedBanner(6, "other.png", "different")
+			}, `{"keep_id":5,"merge_ids":[6]}`, "The images are not identical copies."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				p := newProducersEnv(t)
+				example.setup(p)
+				rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/merge", example.body)
+				if rec.Code < http.StatusBadRequest {
+					t.Fatalf("expected a refusal, got %d", rec.Code)
+				}
+				event := p.single(t)
+				assertProducerEvent(t, event, "media.merge", audit.CategoryMedia, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+			})
+		}
+	})
+
+	t.Run("A manual purge is recorded once and not as separate merges", func(t *testing.T) {
+		p := newProducersEnv(t)
+		seedTwoGroupPurgePlan(p)
+		rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/purge", "")
+		assertAPIKeyStatus(t, rec, http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.purge", audit.CategoryMedia, audit.OutcomeSuccess)
+		assertProducerOwnerOrigin(t, event)
+		if got := paramsJSON(t, event); got != `{"articles_updated":5,"merged":3}` {
+			t.Errorf("params = %s", got)
+		}
+	})
+
+	t.Run("A partly failed manual purge is a success with the failed group count", func(t *testing.T) {
+		p := newProducersEnv(t)
+		seedThreeGroupPurgePlan(p, 5)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/purge", ""), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.purge", audit.CategoryMedia, audit.OutcomeSuccess)
+		if !strings.Contains(paramsJSON(t, event), `"failed_groups":1`) {
+			t.Errorf("params = %s", paramsJSON(t, event))
+		}
+	})
+
+	t.Run("A refused manual purge is recorded as failed", func(t *testing.T) {
+		p := newProducersEnv(t)
+		seedTwoGroupPurgePlan(p)
+		rec := p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/purge", `{"fingerprint":"stale"}`)
+		assertAPIKeyStatus(t, rec, http.StatusConflict)
+		event := p.single(t)
+		assertProducerEvent(t, event, "media.purge", audit.CategoryMedia, audit.OutcomeFailed)
+		assertProducerFailure(t, event, "The library changed since the preview. Review it again.")
+	})
+
+	t.Run("Browsing and the media usage lookup are never recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "h")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/media", ""), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/media/5/usage", ""), http.StatusOK)
+		p.noEvent(t)
+	})
+}
+
+func (p *producersEnv) seedArticleUsing(id uint32, body string) {
+	p.articles.articles[id] = article.Article{ID: id, Title: "Article " + strconv.Itoa(int(id)), Body: body}
+}
+
+func seedTwoGroupPurgePlan(p *producersEnv) {
+	p.seedBanner(1, "kept-a.png", "hash-a")
+	p.seedBanner(2, "copy-a1.png", "hash-a")
+	p.seedBanner(3, "copy-a2.png", "hash-a")
+	p.seedBanner(4, "kept-b.png", "hash-b")
+	p.seedBanner(5, "copy-b1.png", "hash-b")
+	for id, body := range map[uint32]string{1: "uses 2.png", 2: "uses 3.png", 3: "uses 5.png", 4: "uses 2.png", 5: "uses 3.png", 6: "1.png 4.png", 7: "1.png 4.png", 8: "1.png 4.png"} {
+		p.seedArticleUsing(id, body)
+	}
+}
+
+func seedThreeGroupPurgePlan(p *producersEnv, failingCopy uint32) {
+	p.seedBanner(1, "kept-a.png", "hash-a")
+	p.seedBanner(2, "copy-a.png", "hash-a")
+	p.seedBanner(4, "kept-b.png", "hash-b")
+	p.seedBanner(5, "copy-b.png", "hash-b")
+	p.seedBanner(7, "kept-c.png", "hash-c")
+	p.seedBanner(8, "copy-c.png", "hash-c")
+	for id, body := range map[uint32]string{1: "uses 2.png", 2: "uses 5.png", 3: "uses 8.png", 4: "1.png 4.png 7.png", 5: "1.png 4.png 7.png"} {
+		p.seedArticleUsing(id, body)
+	}
+	p.images.failDeleteFor = map[uint32]error{failingCopy: errors.New("storage offline")}
+}
+
+func TestActivityLogProducersUsers(t *testing.T) {
+	t.Run("Changing the display name records a before and after", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/user/me", `{"display_name":"Marta Alves 2"}`), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "user.update_profile", audit.CategoryUsers, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "user", "1", "Marta Alves 2")
+		if got := changesJSON(t, event); got != `[{"field":"display_name","kind":"text","before":"Marta Alves","after":"Marta Alves 2"}]` {
+			t.Errorf("changes = %s", got)
+		}
+		if event.Actor.Name != producersOwnerName {
+			t.Errorf("the actor snapshot name = %q, expected the name held when the request began", event.Actor.Name)
+		}
+	})
+
+	t.Run("Setting a display name that does not change records nothing", func(t *testing.T) {
+		for _, sent := range []string{"Marta Alves", "  Marta Alves  "} {
+			p := newProducersEnv(t)
+			assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/user/me", `{"display_name":"`+sent+`"}`), http.StatusOK)
+			p.noEvent(t)
+		}
+	})
+
+	t.Run("A display name that is too long is recorded as failed", func(t *testing.T) {
+		p := newProducersEnv(t)
+		rec := p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/user/me", `{"display_name":"`+strings.Repeat("a", 61)+`"}`)
+		assertAPIKeyStatus(t, rec, http.StatusBadRequest)
+		event := p.single(t)
+		assertProducerEvent(t, event, "user.update_profile", audit.CategoryUsers, audit.OutcomeFailed)
+		assertProducerFailure(t, event, "That display name is too long.")
+		if len(event.Changes) != 0 {
+			t.Errorf("changes = %+v", event.Changes)
+		}
+	})
+
+	t.Run("Creating an invite is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/user/invite", `{"email":"new@example.com"}`), http.StatusCreated)
+		event := p.single(t)
+		assertProducerEvent(t, event, "invite.create", audit.CategoryUsers, audit.OutcomeSuccess)
+		assertProducerOwnerOrigin(t, event)
+		assertProducerTarget(t, event, "invite", "1", "new@example.com")
+		if encoded, _ := json.Marshal(event); strings.Contains(string(encoded), "hashed:") {
+			t.Errorf("the stored event holds a code hash: %s", encoded)
+		}
+	})
+
+	t.Run("A refused invite action is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name   string
+			setup  func(p *producersEnv)
+			method string
+			path   string
+			body   string
+			action string
+			reason string
+		}{
+			{"ErrEmailHasAccount", func(*producersEnv) {}, http.MethodPost, "/v1/user/invite", `{"email":"dev@example.com"}`, "invite.create", "That email already has an account."},
+			{"ErrPendingInvite", func(p *producersEnv) { p.seedPendingInvite("new@example.com") }, http.MethodPost, "/v1/user/invite", `{"email":"new@example.com"}`, "invite.create", "An invitation is already pending for that email."},
+			{"ErrInviteEmailNotSent on create", func(p *producersEnv) { p.mail.fail.failNext("Send") }, http.MethodPost, "/v1/user/invite", `{"email":"new@example.com"}`, "invite.create", "The invitation email could not be sent."},
+			{"ErrInviteEmailNotSent on renew", func(p *producersEnv) { p.seedPendingInvite("new@example.com"); p.mail.fail.failNext("Send") }, http.MethodPost, "/v1/user/invite/1/renew", "", "invite.renew", "The invitation email could not be sent."},
+			{"ErrInviteAlreadyAccepted on renew", func(p *producersEnv) { p.seedAcceptedInvite("new@example.com") }, http.MethodPost, "/v1/user/invite/1/renew", "", "invite.renew", "That invitation was already accepted."},
+			{"ErrInviteAlreadyAccepted on cancel", func(p *producersEnv) { p.seedAcceptedInvite("new@example.com") }, http.MethodDelete, "/v1/user/invite/1", "", "invite.cancel", "That invitation was already accepted."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				p := newProducersEnv(t)
+				example.setup(p)
+				rec := p.as(t, apiKeyOwnerId, example.method, example.path, example.body)
+				if rec.Code < http.StatusBadRequest {
+					t.Fatalf("expected a refusal, got %d", rec.Code)
+				}
+				event := p.single(t)
+				assertProducerEvent(t, event, example.action, audit.CategoryUsers, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+			})
+		}
+	})
+
+	t.Run("Cancelling an invite is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedPendingInvite("new@example.com")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/user/invite/1", ""), http.StatusNoContent)
+		event := p.single(t)
+		assertProducerEvent(t, event, "invite.cancel", audit.CategoryUsers, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "invite", "1", "new@example.com")
+	})
+
+	t.Run("Renewing an invite is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedPendingInvite("new@example.com")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/user/invite/1/renew", ""), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "invite.renew", audit.CategoryUsers, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "invite", "1", "new@example.com")
+	})
+
+	t.Run("An invite or user that does not exist records nothing", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/user/invite/99", ""), http.StatusNotFound)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/user/invite/99/renew", ""), http.StatusNotFound)
+		p.noEvent(t)
+	})
+
+	t.Run("Reads and checks are never recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		for _, path := range []string{"/v1/user", "/v1/auth/me", "/v1/auth/registration"} {
+			rec := p.as(t, apiKeyOwnerId, http.MethodGet, path, "")
+			assertAPIKeyStatus(t, rec, http.StatusOK)
+		}
+		p.noEvent(t)
+	})
+}
+
+func (p *producersEnv) seedAcceptedInvite(email string) {
+	accepted := time.Now().Add(-time.Hour)
+	p.invites.seed(invite.Invite{Email: email, HashedCode: "hashed:code", ExpiresAt: time.Now().Add(24 * time.Hour), InvitedBy: apiKeyOwnerId, AcceptedAt: &accepted, CreatedAt: time.Now().Add(-2 * time.Hour)})
+}
+
+func TestActivityLogProducersSystem(t *testing.T) {
+	t.Run("Checking for an update is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/check", ""), http.StatusOK)
+		event := p.single(t)
+		assertProducerEvent(t, event, "system.update_checked", audit.CategorySystem, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "release", "v2.3.0-beta", "v2.3.0-beta")
+		if got := paramsJSON(t, event); got != `{"update_available":true}` {
+			t.Errorf("params = %s", got)
+		}
+	})
+
+	t.Run("A failed update check is recorded with a plain reason", func(t *testing.T) {
+		for _, example := range []struct {
+			name   string
+			err    error
+			reason string
+		}{
+			{"ErrFeedUnavailable", update.ErrFeedUnavailable, "The release feed could not be reached."},
+			{"ErrNoRelease", update.ErrNoRelease, "No release was found."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				p := newProducersEnv(t)
+				p.feed.err = example.err
+				assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/check", ""), http.StatusInternalServerError)
+				event := p.single(t)
+				assertProducerEvent(t, event, "system.update_checked", audit.CategorySystem, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+				if event.Target != (audit.Target{}) {
+					t.Errorf("target = %+v", event.Target)
+				}
+			})
+		}
+	})
+
+	t.Run("The status poll is never recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/system/update", ""), http.StatusOK)
+		p.noEvent(t)
+	})
+
+	t.Run("A restart request is recorded", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/restart", ""), http.StatusAccepted)
+		event := p.single(t)
+		assertProducerEvent(t, event, "system.restart_requested", audit.CategorySystem, audit.OutcomeSuccess)
+		assertProducerOwnerOrigin(t, event)
+		if got := paramsJSON(t, event); got != `{"kind":"restart"}` {
+			t.Errorf("params = %s", got)
+		}
+		if event.Target != (audit.Target{}) {
+			t.Errorf("target = %+v", event.Target)
+		}
+	})
+}
+
+func (p *producersEnv) listedActions(t *testing.T, category string) []string {
+	t.Helper()
+	listing := p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/activity?category="+category, "")
+	assertAPIKeyStatus(t, listing, http.StatusOK)
+	var page struct {
+		Items []struct {
+			Action   string `json:"action"`
+			Category string `json:"category"`
+		} `json:"items"`
+	}
+	if err := json.Unmarshal(listing.Body.Bytes(), &page); err != nil {
+		t.Fatal(err)
+	}
+	actions := []string{}
+	for _, item := range page.Items {
+		if item.Category != category {
+			t.Errorf("item category = %q, expected %q", item.Category, category)
+		}
+		actions = append(actions, item.Action)
+	}
+	return actions
+}
+
+func TestActivityLogProducersReadBackOtherCategories(t *testing.T) {
+	t.Run("Media events are listed under their category", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "same")
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/media/5", `{"filename":"spring"}`), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/media/5", ""), http.StatusNoContent)
+		if got := strings.Join(p.listedActions(t, "media"), ","); got != "media.delete,media.rename" {
+			t.Errorf("actions = %s", got)
+		}
+		if got := p.listedActions(t, "articles"); len(got) != 0 {
+			t.Errorf("articles actions = %v", got)
+		}
+	})
+
+	t.Run("User events are listed under their category", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/user/me", `{"display_name":"Marta Alves 2"}`), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/user/invite", `{"email":"new@example.com"}`), http.StatusCreated)
+		if got := strings.Join(p.listedActions(t, "users"), ","); got != "invite.create,user.update_profile" {
+			t.Errorf("actions = %s", got)
+		}
+	})
+
+	t.Run("System events are listed under their category", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/check", ""), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/system/update/restart", ""), http.StatusAccepted)
+		if got := strings.Join(p.listedActions(t, "system"), ","); got != "system.restart_requested,system.update_checked" {
+			t.Errorf("actions = %s", got)
+		}
+	})
+}
+
+func TestActivityLogProducersReadBack(t *testing.T) {
+	t.Run("Producer events are listed with their documented shape", func(t *testing.T) {
+		p := newProducersEnv(t)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/article", `{"title":"Spring release","body":"Hello"}`), http.StatusCreated)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/1", `{"body":"Hello world"}`), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/article/1/publish", ""), http.StatusOK)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodDelete, "/v1/article/1", ""), http.StatusNoContent)
+
+		listing := p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/activity?category=articles", "")
+		assertAPIKeyStatus(t, listing, http.StatusOK)
+		var page struct {
+			Items []struct {
+				Action   string `json:"action"`
+				Category string `json:"category"`
+				Target   struct {
+					Exists bool `json:"exists"`
+				} `json:"target"`
+			} `json:"items"`
+		}
+		if err := json.Unmarshal(listing.Body.Bytes(), &page); err != nil {
+			t.Fatal(err)
+		}
+		var actions []string
+		for _, item := range page.Items {
+			actions = append(actions, item.Action)
+			if item.Category != "articles" || item.Target.Exists {
+				t.Errorf("item = %+v", item)
+			}
+		}
+		if strings.Join(actions, ",") != "article.delete,article.publish,article.edit,article.create" {
+			t.Errorf("actions = %v", actions)
+		}
+	})
+
+	t.Run("A failed producer event is filterable", func(t *testing.T) {
+		p := newProducersEnv(t)
+		p.seedBanner(5, "banner.png", "same")
+		p.as(t, apiKeyOwnerId, http.MethodPost, "/v1/media/merge", `{"keep_id":5,"merge_ids":[6]}`)
+		assertAPIKeyStatus(t, p.as(t, apiKeyOwnerId, http.MethodPatch, "/v1/media/5", `{"filename":"spring"}`), http.StatusOK)
+
+		listing := p.as(t, apiKeyOwnerId, http.MethodGet, "/v1/activity?outcome=failed", "")
+		assertAPIKeyStatus(t, listing, http.StatusOK)
+		var page struct {
+			Items []struct {
+				Action        string  `json:"action"`
+				FailureReason *string `json:"failure_reason"`
+			} `json:"items"`
+		}
+		if err := json.Unmarshal(listing.Body.Bytes(), &page); err != nil {
+			t.Fatal(err)
+		}
+		if len(page.Items) != 1 || page.Items[0].Action != "media.merge" || page.Items[0].FailureReason == nil || *page.Items[0].FailureReason != "One of the copies no longer exists." {
+			t.Errorf("items = %+v", page.Items)
+		}
+	})
+}

test/activity_log_producers_test.go

@@ -0,0 +1,770 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/image"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/purge"
+	"RenewCMS/internal/domain/update"
+	"RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/useCases"
+	"context"
+	"crypto/ed25519"
+	"crypto/rand"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"strings"
+	"testing"
+	"time"
+	"unicode/utf8"
+)
+
+const producerSignalTimeout = 5 * time.Second
+
+type producerSignalRecorder struct {
+	inner    audit.Recorder
+	recorded chan struct{}
+}
+
+var _ audit.Recorder = &producerSignalRecorder{}
+
+func newProducerSignalRecorder(inner audit.Recorder) *producerSignalRecorder {
+	return &producerSignalRecorder{inner: inner, recorded: make(chan struct{}, 16)}
+}
+
+func (r *producerSignalRecorder) Record(ctx context.Context, event audit.Event) {
+	r.inner.Record(ctx, event)
+	r.recorded <- struct{}{}
+}
+
+func (r *producerSignalRecorder) await(t *testing.T) {
+	t.Helper()
+	select {
+	case <-r.recorded:
+	case <-time.After(producerSignalTimeout):
+		t.Fatal("no event was recorded")
+	}
+}
+
+type producerPurgeRunner struct {
+	result purge.RunResult
+	err    error
+	calls  int
+}
+
+var _ useCases.PurgeRunner = &producerPurgeRunner{}
+
+func (r *producerPurgeRunner) Execute(*string) (purge.RunResult, error) {
+	r.calls++
+	return r.result, r.err
+}
+
+type producerBlockingImageRepo struct {
+	*mockImageRepo
+	entered chan struct{}
+	release chan struct{}
+}
+
+func (r *producerBlockingImageRepo) ListDuplicates() ([]image.Image, error) {
+	r.entered <- struct{}{}
+	<-r.release
+	return r.mockImageRepo.ListDuplicates()
+}
+
+func producerContext(actor audit.Actor, source audit.Source) context.Context {
+	return audit.WithOrigin(context.Background(), audit.Origin{Actor: actor, Source: source, IP: "192.0.2.1", UserAgent: "producers-test/1.0"})
+}
+
+func producerOwnerContext() context.Context {
+	id := uint32(1)
+	return producerContext(audit.Actor{Type: audit.ActorUser, ID: &id, Name: "Marta Alves"}, audit.SourceWeb)
+}
+
+func producerAnonymousContext() context.Context {
+	return producerContext(audit.AnonymousActor(""), audit.SourceWeb)
+}
+
+func onlyEvent(t *testing.T, h *activityHarness) audit.Event {
+	t.Helper()
+	events := h.all(t)
+	if len(events) != 1 {
+		t.Fatalf("expected exactly one event, got %d: %+v", len(events), events)
+	}
+	return events[0]
+}
+
+func assertNoEvents(t *testing.T, h *activityHarness) {
+	t.Helper()
+	if events := h.all(t); len(events) != 0 {
+		t.Fatalf("expected no event, got %+v", events)
+	}
+}
+
+func assertEventsHoldNothing(t *testing.T, h *activityHarness, forbidden ...string) {
+	t.Helper()
+	encoded, err := json.Marshal(h.all(t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, secret := range forbidden {
+		if strings.Contains(string(encoded), secret) || strings.Contains(h.logs.String(), secret) {
+			t.Errorf("an event or the log holds %q: %s", secret, encoded)
+		}
+	}
+}
+
+func TestActivityLogProducersArticleChanges(t *testing.T) {
+	t.Run("The delta is signed and counts characters", func(t *testing.T) {
+		for _, example := range []struct {
+			before int
+			after  int
+			delta  int
+		}{{100, 412, 312}, {412, 100, -312}, {5, 5, 0}} {
+			t.Run(fmt.Sprintf("%d to %d", example.before, example.after), func(t *testing.T) {
+				h := newActivityHarness(t)
+				repo := newMockArticleRepo()
+				repo.articles[8] = article.Article{ID: 8, Title: "Spring release", Body: strings.Repeat("a", example.before)}
+				uc := useCases.NewUpdateArticleUseCase(repo, &fakeBodyRenderer{}, h.recorder)
+
+				if _, err := uc.UpdateBody(producerOwnerContext(), 8, strings.Repeat("b", example.after), article.BodyFormatHTML); err != nil {
+					t.Fatal(err)
+				}
+
+				event := onlyEvent(t, h)
+				if len(event.Changes) != 1 || event.Changes[0].Delta == nil || *event.Changes[0].Delta != example.delta || event.Changes[0].Field != "body" || event.Changes[0].Kind != audit.ChangeBody {
+					t.Errorf("changes = %+v", event.Changes)
+				}
+				assertEventsHoldNothing(t, h, "bbbb")
+			})
+		}
+	})
+
+	t.Run("A body with multi-byte characters is counted in characters", func(t *testing.T) {
+		h := newActivityHarness(t)
+		repo := newMockArticleRepo()
+		repo.articles[8] = article.Article{ID: 8, Title: "Spring release", Body: "héllo"}
+		uc := useCases.NewUpdateArticleUseCase(repo, &fakeBodyRenderer{}, h.recorder)
+
+		if _, err := uc.UpdateBody(producerOwnerContext(), 8, "héllo wörld", article.BodyFormatHTML); err != nil {
+			t.Fatal(err)
+		}
+
+		event := onlyEvent(t, h)
+		if event.Changes[0].Delta == nil || *event.Changes[0].Delta != 6 || utf8.RuneCountInString("héllo wörld")-utf8.RuneCountInString("héllo") != 6 {
+			t.Errorf("changes = %+v", event.Changes)
+		}
+	})
+
+	t.Run("A title change is recorded as a text diff when a title edit exists", func(t *testing.T) {
+		before := article.Article{ID: 8, Title: "Spring release", Body: "x", IsOnline: false}
+		after := article.Article{ID: 8, Title: "Spring release 2", Body: "x", IsOnline: false}
+
+		changes := audit.ArticleChanges(before, after)
+
+		encoded, _ := json.Marshal(changes)
+		if string(encoded) != `[{"field":"title","kind":"text","before":"Spring release","after":"Spring release 2"}]` {
+			t.Errorf("changes = %s", encoded)
+		}
+	})
+
+	t.Run("Only the fields title, online and body can ever appear in an article event's changes", func(t *testing.T) {
+		before := article.Article{ID: 8, Title: "a", Body: "x", IsOnline: false}
+		after := article.Article{ID: 9, Title: "b", Body: "y", IsOnline: true}
+
+		for _, change := range audit.ArticleChanges(before, after) {
+			if change.Field != "title" && change.Field != "online" && change.Field != "body" {
+				t.Errorf("unexpected field %q", change.Field)
+			}
+			if change.Kind != audit.ChangeText && change.Kind != audit.ChangeBody {
+				t.Errorf("unexpected kind %q", change.Kind)
+			}
+		}
+	})
+
+	t.Run("A refused article title is recorded as failed with a plain reason", func(t *testing.T) {
+		h := newActivityHarness(t)
+		uc := useCases.NewCreateArticleUseCase(newMockArticleRepo(), &fakeBodyRenderer{}, h.recorder)
+
+		_, err := uc.CreateArticle(producerOwnerContext(), useCases.CreateArticleCommand{Title: "ab", Body: "Hello"})
+
+		if !errors.Is(err, article.ErrInvalidTitle) {
+			t.Fatalf("err = %v", err)
+		}
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "article.create", audit.CategoryArticles, audit.OutcomeFailed)
+		assertProducerFailure(t, event, "The title must be between 3 and 200 characters.")
+	})
+}
+
+func TestActivityLogProducersFailureReasons(t *testing.T) {
+	sentences := []struct {
+		cause    error
+		sentence string
+	}{
+		{article.ErrInvalidTitle, "The title must be between 3 and 200 characters."},
+		{image.ErrImageTypeNotAllowed, "The file must be a PNG, JPEG, WEBP or SVG image."},
+		{image.ErrImageTooLarge, "The file is too large to upload."},
+		{image.ErrImageUnreadable, "The image could not be read."},
+		{image.ErrInvalidFilename, "That file name is not valid."},
+		{image.ErrInvalidMergeRequest, "The merge request is not valid."},
+		{image.ErrMergeCopyMissing, "One of the copies no longer exists."},
+		{image.ErrMergeHashMismatch, "The images are not identical copies."},
+		{purge.ErrPurgeConflict, "The library changed since the preview. Review it again."},
+		{user.ErrRegistrationClosed, "Registration is closed on this site."},
+		{user.ErrVerificationEmailNotSent, "The verification email could not be sent."},
+		{user.ErrInvalidVerificationCode, "The verification code is not valid."},
+		{user.ErrVerificationCodeExpired, "The verification code has expired."},
+		{user.ErrInvalidDisplayName, "That display name is too long."},
+		{user.ErrUsernameTaken, "That username is already taken."},
+		{invite.ErrEmailHasAccount, "That email already has an account."},
+		{invite.ErrPendingInvite, "An invitation is already pending for that email."},
+		{invite.ErrInviteEmailNotSent, "The invitation email could not be sent."},
+		{invite.ErrInviteAlreadyAccepted, "That invitation was already accepted."},
+		{invite.ErrInviteInvalid, "That invitation is not valid."},
+		{invite.ErrInviteExpired, "That invitation has expired."},
+		{update.ErrFeedUnavailable, "The release feed could not be reached."},
+		{update.ErrNoRelease, "No release was found."},
+		{update.ErrNotPrepared, "This server cannot apply updates."},
+		{update.ErrJobInProgress, "An update is already being downloaded."},
+		{update.ErrRestartPending, "A restart is already pending."},
+		{update.ErrNothingToUpdate, "There is nothing to update."},
+		{update.ErrPreflightRefused, "The update cannot be downloaded."},
+		{update.ErrRestartKindMismatch, "The requested restart does not match the server state."},
+	}
+
+	dueSettings := func() *mockPurgeSettingsRepo {
+		repo := newMockPurgeSettingsRepo()
+		repo.settings = purge.Settings{AutoPurgeEnabled: true, AutoPurgeIntervalDays: 1, EnabledAt: purgeTime("2026-09-01T00:00:00Z")}
+		return repo
+	}
+	failWith := func(t *testing.T, err error) audit.Event {
+		t.Helper()
+		h := newActivityHarness(t)
+		scheduler := useCases.NewPurgeSchedulerUseCase(dueSettings(), &producerPurgeRunner{err: err}, h.recorder)
+		if _, _, tickErr := scheduler.Tick(*purgeTime("2026-10-05T09:00:00Z")); !errors.Is(tickErr, err) {
+			t.Fatalf("tick err = %v", tickErr)
+		}
+		return onlyEvent(t, h)
+	}
+
+	t.Run("Failure reasons are mapped from domain sentinels", func(t *testing.T) {
+		for _, example := range sentences {
+			t.Run(example.cause.Error(), func(t *testing.T) {
+				event := failWith(t, fmt.Errorf("while working: %w", example.cause))
+				assertProducerFailure(t, event, example.sentence)
+			})
+		}
+	})
+
+	t.Run("Unmapped errors become the generic sentence", func(t *testing.T) {
+		for name, err := range map[string]error{
+			"a plain error":                                errors.New("db is locked"),
+			"an error carrying an SMTP host":               errors.New("dial smtp.internal.example:587 with password hunter2"),
+			"an error carrying a file system path":         errors.New(`open C:\data\secret\file.db`),
+			"an error wrapping a sentinel and a raw cause": errors.Join(update.ErrFeedUnavailable, errors.New("token=abc123")),
+		} {
+			t.Run(name, func(t *testing.T) {
+				event := failWith(t, err)
+				if name == "an error wrapping a sentinel and a raw cause" {
+					assertProducerFailure(t, event, "The release feed could not be reached.")
+				} else {
+					assertProducerFailure(t, event, useCases.GenericFailureReason)
+				}
+				encoded, _ := json.Marshal(event)
+				for _, leaked := range []string{"locked", "hunter2", "smtp.internal", "secret", "abc123"} {
+					if strings.Contains(string(encoded), leaked) {
+						t.Errorf("the event leaks %q: %s", leaked, encoded)
+					}
+				}
+			})
+		}
+	})
+
+	t.Run("Every failure reason fits the stored limit", func(t *testing.T) {
+		for _, example := range sentences {
+			if len(example.sentence) > 255 {
+				t.Errorf("%q is %d characters", example.sentence, len(example.sentence))
+			}
+		}
+		if len(useCases.GenericFailureReason) > 255 {
+			t.Errorf("the generic sentence is too long")
+		}
+	})
+
+	t.Run("A failed event keeps its target when the target is known", func(t *testing.T) {
+		h := newActivityHarness(t)
+		images := newMockImageRepo()
+		images.images[5] = image.Image{ID: 5, Filename: "banner.png", Path: "/static/uploadedImages/5.png"}
+		uc := useCases.NewRenameMediaUseCase(images, h.recorder)
+
+		if _, err := uc.Rename(producerOwnerContext(), 5, "not valid!"); !errors.Is(err, image.ErrInvalidFilename) {
+			t.Fatalf("err = %v", err)
+		}
+
+		assertProducerTarget(t, onlyEvent(t, h), "image", "5", "banner.png")
+	})
+}
+
+func TestActivityLogProducersScheduledPurge(t *testing.T) {
+	due := func() *mockPurgeSettingsRepo {
+		repo := newMockPurgeSettingsRepo()
+		repo.settings = purge.Settings{AutoPurgeEnabled: true, AutoPurgeIntervalDays: 10, EnabledAt: purgeTime("2026-09-20T09:00:00Z")}
+		return repo
+	}
+	now := *purgeTime("2026-10-05T09:00:00Z")
+
+	t.Run("The scheduled purge is a system event", func(t *testing.T) {
+		h := newActivityHarness(t)
+		runner := &producerPurgeRunner{result: purge.RunResult{GroupsTotal: 2, GroupsPurged: 2, Merged: 3, ArticlesUpdated: 5}}
+		scheduler := useCases.NewPurgeSchedulerUseCase(due(), runner, h.recorder)
+
+		if _, ran, err := scheduler.Tick(now); err != nil || !ran {
+			t.Fatalf("ran = %v, err = %v", ran, err)
+		}
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "system.media_purge", audit.CategorySystem, audit.OutcomeSuccess)
+		if event.Actor.Type != audit.ActorSystem || event.Actor.Name != "System" || event.Source != audit.SourceSystem || event.IP != nil || event.UserAgent != nil {
+			t.Errorf("event = %+v", event)
+		}
+		if got := paramsJSON(t, event); got != `{"articles_updated":5,"merged":3}` {
+			t.Errorf("params = %s", got)
+		}
+	})
+
+	t.Run("A scheduled purge with a failed group records the failed group count", func(t *testing.T) {
+		h := newActivityHarness(t)
+		runner := &producerPurgeRunner{result: purge.RunResult{GroupsTotal: 3, GroupsPurged: 2, FailedGroups: 1, Merged: 2, ArticlesUpdated: 2}}
+		scheduler := useCases.NewPurgeSchedulerUseCase(due(), runner, h.recorder)
+
+		if _, _, err := scheduler.Tick(now); err != nil {
+			t.Fatal(err)
+		}
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "system.media_purge", audit.CategorySystem, audit.OutcomeSuccess)
+		if !strings.Contains(paramsJSON(t, event), `"failed_groups":1`) {
+			t.Errorf("params = %s", paramsJSON(t, event))
+		}
+	})
+
+	t.Run("A scheduled purge that is not due or merges nothing records nothing", func(t *testing.T) {
+		h := newActivityHarness(t)
+		notDue := newMockPurgeSettingsRepo()
+		runner := &producerPurgeRunner{}
+		if _, ran, err := useCases.NewPurgeSchedulerUseCase(notDue, runner, h.recorder).Tick(now); err != nil || ran {
+			t.Fatalf("ran = %v, err = %v", ran, err)
+		}
+		if _, ran, err := useCases.NewPurgeSchedulerUseCase(due(), runner, h.recorder).Tick(now); err != nil || !ran {
+			t.Fatalf("ran = %v, err = %v", ran, err)
+		}
+		assertNoEvents(t, h)
+	})
+
+	t.Run("A scheduled purge that cannot record its run is a failed system event", func(t *testing.T) {
+		h := newActivityHarness(t)
+		runner := &producerPurgeRunner{err: errRepositoryFailure}
+
+		if _, _, err := useCases.NewPurgeSchedulerUseCase(due(), runner, h.recorder).Tick(now); err == nil {
+			t.Fatal("expected an error")
+		}
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "system.media_purge", audit.CategorySystem, audit.OutcomeFailed)
+		assertProducerFailure(t, event, useCases.GenericFailureReason)
+	})
+
+	t.Run("A refused manual purge is recorded as failed when a purge is already running", func(t *testing.T) {
+		h := newActivityHarness(t)
+		images := &producerBlockingImageRepo{mockImageRepo: newMockImageRepo(), entered: make(chan struct{}, 2), release: make(chan struct{})}
+		articles := newMockArticleRepo()
+		storage := newMockImageStorage()
+		merge := useCases.NewMergeMediaUseCase(images, articles, storage, h.recorder)
+		run := useCases.NewRunPurgeUseCase(images, articles, merge, newMockPurgeSettingsRepo(), func() time.Time { return now }, log.New(io.Discard, "", 0), h.recorder)
+
+		finished := make(chan struct{})
+		go func() {
+			defer close(finished)
+			_, _ = run.Run(producerOwnerContext(), nil)
+		}()
+		<-images.entered
+
+		_, err := run.Run(producerOwnerContext(), nil)
+		close(images.release)
+		<-finished
+
+		if !errors.Is(err, purge.ErrPurgeBusy) {
+			t.Fatalf("err = %v", err)
+		}
+		events := h.all(t)
+		if len(events) != 2 {
+			t.Fatalf("events = %+v", events)
+		}
+		busy := events[1]
+		if events[0].Outcome == audit.OutcomeFailed {
+			busy = events[0]
+		}
+		assertProducerEvent(t, busy, "media.purge", audit.CategoryMedia, audit.OutcomeFailed)
+		assertProducerFailure(t, busy, "A purge is already running.")
+	})
+}
+
+func TestActivityLogProducersAccounts(t *testing.T) {
+	const password = "s3cretpassw0rd"
+	newUsers := func() *mockUserRepo {
+		users := newMockUserRepo()
+		return users
+	}
+
+	t.Run("Registering is recorded with the new account as actor", func(t *testing.T) {
+		h := newActivityHarness(t)
+		uc := useCases.NewCreateUserUseCase(newUsers(), &stubHasher{}, newMockMailRepo(), "https://cms.example.com", h.recorder)
+
+		created, err := uc.CreateUser(producerAnonymousContext(), useCases.CreateUserCommand{Username: "marta", Password: password, Email: "marta@example.com"})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "user.register", audit.CategoryUsers, audit.OutcomeSuccess)
+		if event.Actor.Type != audit.ActorUser || event.Actor.ID == nil || *event.Actor.ID != created.ID || event.Actor.Name != "marta" || event.Source != audit.SourceWeb {
+			t.Errorf("actor = %+v, source = %s", event.Actor, event.Source)
+		}
+		assertProducerTarget(t, event, "user", "1", "marta")
+		assertEventsHoldNothing(t, h, password, "hashed:", created.VerificationCode)
+	})
+
+	t.Run("A refused registration is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			cause  string
+			setup  func(users *mockUserRepo, mail *mockMailRepo)
+			reason string
+		}{
+			{"registration is closed", func(users *mockUserRepo, _ *mockMailRepo) {
+				users.users[9] = user.User{ID: 9, Username: "owner", IsVerified: true}
+			}, "Registration is closed on this site."},
+			{"the verification email cannot be sent", func(_ *mockUserRepo, mail *mockMailRepo) { mail.fail.failNext("Send") }, "The verification email could not be sent."},
+		} {
+			t.Run(example.cause, func(t *testing.T) {
+				h := newActivityHarness(t)
+				users := newUsers()
+				mail := newMockMailRepo()
+				example.setup(users, mail)
+				uc := useCases.NewCreateUserUseCase(users, &stubHasher{}, mail, "https://cms.example.com", h.recorder)
+
+				if _, err := uc.CreateUser(producerAnonymousContext(), useCases.CreateUserCommand{Username: "marta", Password: password, Email: "marta@example.com"}); err == nil {
+					t.Fatal("expected a refusal")
+				}
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "user.register", audit.CategoryUsers, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+				if event.Actor.Type != audit.ActorAnonymous || event.Actor.Name != "marta" || event.Target != (audit.Target{}) {
+					t.Errorf("actor = %+v, target = %+v", event.Actor, event.Target)
+				}
+				assertEventsHoldNothing(t, h, password)
+			})
+		}
+	})
+
+	t.Run("A failed cleanup after an unsent verification email keeps both causes", func(t *testing.T) {
+		h := newActivityHarness(t)
+		users := newUsers()
+		mail := newMockMailRepo()
+		mail.fail.failNext("Send")
+		cleanupFailure := errors.New("cleanup failure")
+		users.fail.failNextWith("Delete", cleanupFailure)
+		uc := useCases.NewCreateUserUseCase(users, &stubHasher{}, mail, "https://cms.example.com", h.recorder)
+
+		_, err := uc.CreateUser(producerAnonymousContext(), useCases.CreateUserCommand{Username: "marta", Password: password, Email: "marta@example.com"})
+
+		if !errors.Is(err, user.ErrVerificationEmailNotSent) || !errors.Is(err, cleanupFailure) {
+			t.Errorf("err = %v", err)
+		}
+		assertProducerFailure(t, onlyEvent(t, h), "The verification email could not be sent.")
+	})
+
+	t.Run("Verifying an account is recorded", func(t *testing.T) {
+		h := newActivityHarness(t)
+		users := newUsers()
+		users.users[4] = user.User{ID: 4, Username: "lea", VerificationCode: "hashed:the-code", VerificationExpiration: time.Now().Add(time.Hour)}
+		uc := useCases.NewVerifyUserUseCase(users, &stubHasher{}, h.recorder)
+
+		if _, err := uc.Verify(producerAnonymousContext(), 4, "the-code"); err != nil {
+			t.Fatal(err)
+		}
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "user.verify", audit.CategoryUsers, audit.OutcomeSuccess)
+		if event.Actor.Type != audit.ActorUser || event.Actor.ID == nil || *event.Actor.ID != 4 {
+			t.Errorf("actor = %+v", event.Actor)
+		}
+		assertProducerTarget(t, event, "user", "4", "lea")
+		assertEventsHoldNothing(t, h, "the-code", "hashed:")
+	})
+
+	t.Run("A refused verification is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name       string
+			code       string
+			expiration time.Time
+			reason     string
+		}{
+			{"ErrInvalidVerificationCode", "wrong", time.Now().Add(time.Hour), "The verification code is not valid."},
+			{"ErrVerificationCodeExpired", "the-code", time.Now().Add(-time.Hour), "The verification code has expired."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				h := newActivityHarness(t)
+				users := newUsers()
+				users.users[4] = user.User{ID: 4, Username: "lea", VerificationCode: "hashed:the-code", VerificationExpiration: example.expiration}
+				uc := useCases.NewVerifyUserUseCase(users, &stubHasher{}, h.recorder)
+
+				if _, err := uc.Verify(producerAnonymousContext(), 4, example.code); err == nil {
+					t.Fatal("expected a refusal")
+				}
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "user.verify", audit.CategoryUsers, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+			})
+		}
+	})
+
+	t.Run("Accepting an invite is recorded with the new account as actor", func(t *testing.T) {
+		h := newActivityHarness(t)
+		users := newUsers()
+		invites := newInviteFakeRepo()
+		invites.users = users
+		seeded := invites.seed(invite.Invite{Email: "new@example.com", HashedCode: "hashed:the-code", ExpiresAt: time.Now().Add(time.Hour)})
+		uc := useCases.NewAcceptInviteUseCase(users, invites, &stubHasher{}, h.recorder)
+
+		created, err := uc.AcceptInvite(producerAnonymousContext(), useCases.AcceptInviteCommand{Code: "the-code", Username: "sam", Password: password})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "invite.accept", audit.CategoryUsers, audit.OutcomeSuccess)
+		if event.Actor.Type != audit.ActorUser || event.Actor.ID == nil || *event.Actor.ID != created.ID || event.Actor.Name != "sam" || event.Source != audit.SourceWeb {
+			t.Errorf("actor = %+v", event.Actor)
+		}
+		assertProducerTarget(t, event, "invite", fmt.Sprint(seeded.ID), "new@example.com")
+		assertEventsHoldNothing(t, h, "the-code", "hashed:", password)
+	})
+
+	t.Run("A refused acceptance is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name      string
+			code      string
+			expiresIn time.Duration
+			existing  []user.User
+			reason    string
+			target    bool
+		}{
+			{"ErrInviteInvalid", "wrong", time.Hour, nil, "That invitation is not valid.", false},
+			{"ErrInviteExpired", "the-code", -time.Hour, nil, "That invitation has expired.", false},
+			{"ErrUsernameTaken", "the-code", time.Hour, []user.User{{ID: 9, Username: "sam", Email: "sam@example.com"}}, "That username is already taken.", true},
+			{"ErrEmailHasAccount", "the-code", time.Hour, []user.User{{ID: 9, Username: "other", Email: "new@example.com"}}, "That email already has an account.", true},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				h := newActivityHarness(t)
+				users := newUsers()
+				for _, existing := range example.existing {
+					users.users[existing.ID] = existing
+				}
+				invites := newInviteFakeRepo()
+				invites.users = users
+				invites.seed(invite.Invite{Email: "new@example.com", HashedCode: "hashed:the-code", ExpiresAt: time.Now().Add(example.expiresIn)})
+				uc := useCases.NewAcceptInviteUseCase(users, invites, &stubHasher{}, h.recorder)
+
+				if _, err := uc.AcceptInvite(producerAnonymousContext(), useCases.AcceptInviteCommand{Code: example.code, Username: "sam", Password: password}); err == nil {
+					t.Fatal("expected a refusal")
+				}
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "invite.accept", audit.CategoryUsers, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+				if event.Actor.Type != audit.ActorAnonymous || event.Actor.Name != "sam" {
+					t.Errorf("actor = %+v", event.Actor)
+				}
+				if (event.Target != audit.Target{}) != example.target {
+					t.Errorf("target = %+v", event.Target)
+				}
+				assertEventsHoldNothing(t, h, "the-code", password)
+			})
+		}
+	})
+}
+
+func TestActivityLogProducersUpdateDownload(t *testing.T) {
+	cancelledOwnerContext := func() (context.Context, context.CancelFunc) {
+		return context.WithCancel(producerOwnerContext())
+	}
+	newRig := func(t *testing.T) (*downloadRig, *activityHarness, *producerSignalRecorder) {
+		t.Helper()
+		h := newActivityHarness(t)
+		signal := newProducerSignalRecorder(h.recorder)
+		rig := newDownloadRig(t)
+		rig.recorder = signal
+		rig.rebuild()
+		return rig, h, signal
+	}
+
+	t.Run("A download that completes is recorded when the job is ready", func(t *testing.T) {
+		rig, h, signal := newRig(t)
+		ctx, cancel := cancelledOwnerContext()
+
+		if _, err := rig.start.Start(ctx); err != nil {
+			t.Fatal(err)
+		}
+		cancel()
+		signal.await(t)
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "system.update_downloaded", audit.CategorySystem, audit.OutcomeSuccess)
+		assertProducerTarget(t, event, "release", downloadTag, downloadTag)
+		if event.Actor.Type != audit.ActorUser || event.Actor.Name != "Marta Alves" || event.Source != audit.SourceWeb || event.IP == nil || *event.IP != "192.0.2.1" {
+			t.Errorf("event = %+v", event)
+		}
+		assertEventsHoldNothing(t, h, "https://", rig.updatesDir)
+	})
+
+	t.Run("A download that fails is recorded with a reason that hides the cause", func(t *testing.T) {
+		for _, example := range []struct {
+			kind   string
+			setup  func(rig *downloadRig)
+			reason string
+		}{
+			{"download", func(rig *downloadRig) { rig.fetcher.errors[rig.assetName] = errDownloadNetwork }, "The update could not be downloaded."},
+			{"verification", func(rig *downloadRig) {
+				_, otherKey, err := ed25519.GenerateKey(rand.Reader)
+				if err != nil {
+					t.Fatal(err)
+				}
+				rig.signChecksums(rig.checksumsFor(rig.assetName, rig.fetcher.files[rig.assetName]), otherKey)
+				rig.publishAssets()
+			}, "The downloaded update failed its integrity check."},
+		} {
+			t.Run(example.kind, func(t *testing.T) {
+				rig, h, signal := newRig(t)
+				example.setup(rig)
+
+				if _, err := rig.start.Start(producerOwnerContext()); err != nil {
+					t.Fatal(err)
+				}
+				signal.await(t)
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "system.update_downloaded", audit.CategorySystem, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+				assertEventsHoldNothing(t, h, "https://", rig.updatesDir, errDownloadNetwork.Error())
+			})
+		}
+	})
+
+	t.Run("A download refused at the start is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name   string
+			setup  func(rig *downloadRig)
+			reason string
+		}{
+			{"ErrNotPrepared", func(rig *downloadRig) { rig.helper.installed = false }, "This server cannot apply updates."},
+			{"ErrJobInProgress", func(rig *downloadRig) {
+				rig.jobs.put(update.Job{Tag: downloadTag, State: update.StateDownloading, StartedAt: time.Now()})
+			}, "An update is already being downloaded."},
+			{"ErrRestartPending", func(rig *downloadRig) {
+				_ = rig.requests.Write(update.RestartRequest{Kind: update.RestartKindRestart, RequestedAt: updateTestCheckedAt})
+			}, "A restart is already pending."},
+			{"ErrNothingToUpdate", func(rig *downloadRig) { rig.store.found = false }, "There is nothing to update."},
+			{"ErrPreflightRefused", func(rig *downloadRig) { rig.dropAsset(update.ChecksumsAssetName) }, "The update cannot be downloaded."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				rig, h, _ := newRig(t)
+				example.setup(rig)
+
+				if _, err := rig.start.Start(producerOwnerContext()); err == nil {
+					t.Fatal("expected a refusal")
+				}
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "system.update_downloaded", audit.CategorySystem, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+			})
+		}
+	})
+}
+
+func TestActivityLogProducersRestart(t *testing.T) {
+	newRequest := func(t *testing.T) (*restartRig, *activityHarness, *useCases.RequestRestartUseCase) {
+		t.Helper()
+		h := newActivityHarness(t)
+		rig := newRestartRig(updateRunning)
+		request := useCases.NewRequestRestartUseCase(rig.store, rig.jobs, rig.helper, rig.results, rig.requests, updateRunning, rig.clock.Now, h.recorder)
+		return rig, h, request
+	}
+
+	t.Run("A restart request is recorded", func(t *testing.T) {
+		_, h, request := newRequest(t)
+
+		if _, err := request.Request(producerOwnerContext(), updateOwnerId, ""); err != nil {
+			t.Fatal(err)
+		}
+
+		event := onlyEvent(t, h)
+		assertProducerEvent(t, event, "system.restart_requested", audit.CategorySystem, audit.OutcomeSuccess)
+		if got := paramsJSON(t, event); got != `{"kind":"restart"}` {
+			t.Errorf("params = %s", got)
+		}
+		if event.Target != (audit.Target{}) {
+			t.Errorf("target = %+v", event.Target)
+		}
+	})
+
+	t.Run("A restart that applies a downloaded update records the kind and version", func(t *testing.T) {
+		rig, h, request := newRequest(t)
+		rig.readyJob()
+
+		if _, err := request.Request(producerOwnerContext(), updateOwnerId, ""); err != nil {
+			t.Fatal(err)
+		}
+
+		if got := paramsJSON(t, onlyEvent(t, h)); got != `{"kind":"update","tag":"`+downloadTag+`"}` {
+			t.Errorf("params = %s", got)
+		}
+	})
+
+	t.Run("A refused restart is recorded as failed", func(t *testing.T) {
+		for _, example := range []struct {
+			name   string
+			setup  func(rig *restartRig)
+			kind   string
+			reason string
+		}{
+			{"ErrNotPrepared", func(rig *restartRig) { rig.helper.installed = false }, "", "This server cannot apply updates."},
+			{"ErrJobInProgress", func(rig *restartRig) {
+				rig.jobs.put(update.Job{Tag: downloadTag, State: update.StateDownloading, StartedAt: restartBaseTime})
+			}, "", "An update is still being downloaded."},
+			{"ErrRestartPending", func(rig *restartRig) {
+				_ = rig.requests.Write(update.RestartRequest{Kind: update.RestartKindRestart, RequestedAt: restartBaseTime})
+			}, "", "A restart is already pending."},
+			{"ErrRestartKindMismatch", func(*restartRig) {}, update.RestartKindUpdate, "The requested restart does not match the server state."},
+		} {
+			t.Run(example.name, func(t *testing.T) {
+				rig, h, request := newRequest(t)
+				example.setup(rig)
+
+				if _, err := request.Request(producerOwnerContext(), updateOwnerId, example.kind); err == nil {
+					t.Fatal("expected a refusal")
+				}
+
+				event := onlyEvent(t, h)
+				assertProducerEvent(t, event, "system.restart_requested", audit.CategorySystem, audit.OutcomeFailed)
+				assertProducerFailure(t, event, example.reason)
+			})
+		}
+	})
+}

test/activity_persistence_test.go

@@ -0,0 +1,400 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/persistence/database"
+	persistence "RenewCMS/internal/infrastructure/persistence/repositories"
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+var activityDatabaseCounter atomic.Int64
+
+func openActivityDatabase(t *testing.T) *gorm.DB {
+	t.Helper()
+	name := fmt.Sprintf("file:activity%d?mode=memory&cache=shared", activityDatabaseCounter.Add(1))
+	db, err := gorm.Open(sqlite.Open(name), &gorm.Config{Logger: logger.Discard})
+	if err != nil {
+		t.Fatalf("failed to open the in-memory database: %v", err)
+	}
+	if err := database.Migrate(db); err != nil {
+		t.Fatalf("failed to migrate: %v", err)
+	}
+	t.Cleanup(func() {
+		if sqlDb, err := db.DB(); err == nil {
+			_ = sqlDb.Close()
+		}
+	})
+	return db
+}
+
+func activityPtr[T any](value T) *T { return &value }
+
+func activityUserEvent(userID uint32, name string, at time.Time) audit.Event {
+	event := audit.NewEvent("article.publish", audit.CategoryArticles)
+	event.CreatedAt = at
+	event.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(userID), Name: name}
+	event.Source = audit.SourceWeb
+	return event
+}
+
+func activityMustAppend(t *testing.T, repo audit.Repository, event audit.Event) audit.Event {
+	t.Helper()
+	stored, err := repo.Append(event)
+	if err != nil {
+		t.Fatalf("append failed: %v", err)
+	}
+	return stored
+}
+
+func activityIDs(events []audit.Event) []uint64 {
+	ids := make([]uint64, 0, len(events))
+	for _, event := range events {
+		ids = append(ids, event.ID)
+	}
+	return ids
+}
+
+func activityDay(day int, hour int) time.Time {
+	return time.Date(2026, time.October, day, hour, 0, 0, 0, time.UTC)
+}
+
+func TestActivityPersistence(t *testing.T) {
+	t.Run("The model is migrated with its indexes", func(t *testing.T) {
+		db := openActivityDatabase(t)
+
+		if !db.Migrator().HasTable("audit_events") {
+			t.Fatal("the audit events table does not exist")
+		}
+		var names []string
+		if err := db.Raw("SELECT name FROM sqlite_master WHERE type = 'index' AND tbl_name = 'audit_events'").Scan(&names).Error; err != nil {
+			t.Fatal(err)
+		}
+		found := map[string]bool{}
+		for _, name := range names {
+			var columns []struct {
+				Name string
+			}
+			if err := db.Raw("SELECT name FROM pragma_index_info(?) ORDER BY seqno", name).Scan(&columns).Error; err != nil {
+				t.Fatal(err)
+			}
+			parts := make([]string, 0, len(columns))
+			for _, column := range columns {
+				parts = append(parts, column.Name)
+			}
+			found[strings.Join(parts, ",")] = true
+		}
+		for _, wanted := range []string{"created_at", "actor_type,actor_id,created_at", "category,created_at"} {
+			if !found[wanted] {
+				t.Errorf("missing index on (%s), have %v", wanted, found)
+			}
+		}
+	})
+
+	t.Run("The persistence implementation exposes no other exported method than the contract", func(t *testing.T) {
+		repoType := reflect.TypeOf(persistence.NewAuditEventRepository(nil))
+		var names []string
+		for i := 0; i < repoType.NumMethod(); i++ {
+			names = append(names, repoType.Method(i).Name)
+		}
+		sort.Strings(names)
+		wanted := []string{"Append", "DeleteOlderThan", "List", "Summary"}
+		if !reflect.DeepEqual(names, wanted) {
+			t.Errorf("expected %v, got %v", wanted, names)
+		}
+	})
+
+	t.Run("An appended event round-trips", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		event := audit.NewEvent("media.purge", audit.CategoryMedia)
+		event.CreatedAt = time.Date(2026, time.October, 6, 10, 42, 18, 0, time.UTC)
+		event.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(3)), Name: "Marta Alves"}
+		event.Target = audit.Target{Type: "article", ID: "8", Name: "Spring release"}
+		event.Source = audit.SourceWeb
+		event.IP = activityPtr("203.0.113.12")
+		event.UserAgent = activityPtr("Chrome 129 on Windows")
+		event.Security = true
+		event.Params = map[string]any{"merged": 3}
+		event.Changes = []audit.Change{
+			{Field: "online", Kind: audit.ChangeText, Before: activityPtr("false"), After: activityPtr("true")},
+			{Field: "body", Kind: audit.ChangeBody, Delta: activityPtr(312)},
+		}
+
+		stored := activityMustAppend(t, repo, event)
+		page, err := repo.List(audit.Filter{Page: 1, Size: 25})
+
+		if err != nil || page.Total != 1 || len(page.Items) != 1 {
+			t.Fatalf("unexpected list: %+v, %v", page, err)
+		}
+		event.ID = stored.ID
+		want, _ := json.Marshal(event)
+		got, _ := json.Marshal(page.Items[0])
+		if string(want) != string(got) {
+			t.Errorf("round trip mismatch\nwant %s\ngot  %s", want, got)
+		}
+		if page.Items[0].FailureReason != nil {
+			t.Errorf("failure_reason must stay null, got %v", *page.Items[0].FailureReason)
+		}
+	})
+
+	t.Run("A system event keeps its null actor id, ip and user agent", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		event := audit.NewEvent(audit.ActionCleanup, audit.CategorySystem)
+		event.CreatedAt = activityDay(6, 3)
+		event.Actor = audit.SystemActor()
+		event.Source = audit.SourceSystem
+
+		activityMustAppend(t, repo, event)
+		page, _ := repo.List(audit.Filter{Page: 1, Size: 25})
+
+		item := page.Items[0]
+		if item.Actor.ID != nil || item.IP != nil || item.UserAgent != nil || item.Actor.Name != "System" {
+			t.Errorf("unexpected system event %+v", item)
+		}
+	})
+
+	t.Run("List sorts by created_at descending then id descending", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		older := activityMustAppend(t, repo, activityUserEvent(1, "a", activityDay(1, 9)))
+		var same []uint64
+		for i := 0; i < 3; i++ {
+			same = append(same, activityMustAppend(t, repo, activityUserEvent(1, "a", activityDay(2, 9))).ID)
+		}
+
+		page, err := repo.List(audit.Filter{Page: 1, Size: 25})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		want := []uint64{same[2], same[1], same[0], older.ID}
+		if !reflect.DeepEqual(activityIDs(page.Items), want) {
+			t.Errorf("expected %v, got %v", want, activityIDs(page.Items))
+		}
+	})
+
+	t.Run("Filters narrow the list and the total", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		add := func(mutate func(*audit.Event)) uint64 {
+			event := activityUserEvent(1, "Someone", activityDay(2, 9))
+			mutate(&event)
+			return activityMustAppend(t, repo, event).ID
+		}
+		user3 := add(func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(3)), Name: "Marta"}
+		})
+		user3Id7 := add(func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(7)), Name: "Seven"}
+		})
+		key7 := add(func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorAPIKey, ID: activityPtr(uint32(7)), Name: "Deploy bot"}
+			e.Source = audit.SourceAPIKey
+		})
+		system := add(func(e *audit.Event) {
+			e.Actor = audit.SystemActor()
+			e.Source = audit.SourceSystem
+			e.Category = audit.CategorySystem
+		})
+		authFailed := add(func(e *audit.Event) {
+			e.Actor = audit.AnonymousActor("mallory")
+			e.Category = audit.CategoryAuth
+			e.Outcome = audit.OutcomeFailed
+			e.Security = true
+		})
+		spring := add(func(e *audit.Event) { e.Target = audit.Target{Type: "article", ID: "8", Name: "Spring release"} })
+		percent := add(func(e *audit.Event) { e.Target = audit.Target{Type: "article", ID: "9", Name: "Sale 50%_ off"} })
+		plain := add(func(e *audit.Event) { e.Target = audit.Target{Type: "article", ID: "10", Name: "Sale 505 off"} })
+		oct1 := add(func(e *audit.Event) { e.CreatedAt = time.Date(2026, time.October, 1, 0, 0, 0, 0, time.UTC) })
+		oct3end := add(func(e *audit.Event) { e.CreatedAt = time.Date(2026, time.October, 3, 23, 59, 59, 0, time.UTC) })
+		oct4 := add(func(e *audit.Event) { e.CreatedAt = time.Date(2026, time.October, 4, 0, 0, 0, 0, time.UTC) })
+		sep30 := add(func(e *audit.Event) { e.CreatedAt = time.Date(2026, time.September, 30, 23, 59, 59, 0, time.UTC) })
+		base := add(func(e *audit.Event) {})
+
+		everyone := []uint64{user3, user3Id7, key7, system, authFailed, spring, percent, plain, oct1, oct3end, oct4, sep30, base}
+		sort.Slice(everyone, func(i, j int) bool { return everyone[i] < everyone[j] })
+		from := time.Date(2026, time.October, 1, 0, 0, 0, 0, time.UTC)
+		to := time.Date(2026, time.October, 4, 0, 0, 0, 0, time.UTC)
+		cases := []struct {
+			name   string
+			filter audit.Filter
+			want   []uint64
+		}{
+			{"actor user:3", audit.Filter{Actor: &audit.ActorRef{Type: audit.ActorUser, ID: activityPtr(uint32(3))}}, []uint64{user3}},
+			{"actor key:7", audit.Filter{Actor: &audit.ActorRef{Type: audit.ActorAPIKey, ID: activityPtr(uint32(7))}}, []uint64{key7}},
+			{"actor system", audit.Filter{Actor: &audit.ActorRef{Type: audit.ActorSystem}}, []uint64{system}},
+			{"category auth", audit.Filter{Category: audit.CategoryAuth}, []uint64{authFailed}},
+			{"outcome failed", audit.Filter{Outcome: audit.OutcomeFailed}, []uint64{authFailed}},
+			{"outcome success", audit.Filter{Outcome: audit.OutcomeSuccess}, withoutIDs(everyone, authFailed)},
+			{"security true", audit.Filter{Security: true}, []uint64{authFailed}},
+			{"q SPRING", audit.Filter{Query: "SPRING"}, []uint64{spring}},
+			{"q actor name", audit.Filter{Query: "marta"}, []uint64{user3}},
+			{"q 50%_", audit.Filter{Query: "50%_"}, []uint64{percent}},
+			{"date range", audit.Filter{From: &from, To: &to}, []uint64{user3, user3Id7, key7, system, authFailed, spring, percent, plain, oct1, oct3end, base}},
+		}
+		for _, c := range cases {
+			t.Run(c.name, func(t *testing.T) {
+				filter := c.filter
+				filter.Page, filter.Size = 1, 100
+				page, err := repo.List(filter)
+				if err != nil {
+					t.Fatal(err)
+				}
+				got := activityIDs(page.Items)
+				sort.Slice(got, func(i, j int) bool { return got[i] < got[j] })
+				want := append([]uint64(nil), c.want...)
+				sort.Slice(want, func(i, j int) bool { return want[i] < want[j] })
+				if !reflect.DeepEqual(got, want) || page.Total != len(want) {
+					t.Errorf("expected %v (total %d), got %v (total %d)", want, len(want), got, page.Total)
+				}
+			})
+		}
+	})
+
+	t.Run("Paging slices the sorted list and total is the unpaged count", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		var ids []uint64
+		for i := 0; i < 60; i++ {
+			ids = append(ids, activityMustAppend(t, repo, activityUserEvent(1, "a", activityDay(2, 9).Add(time.Duration(i)*time.Minute))).ID)
+		}
+
+		page, err := repo.List(audit.Filter{Page: 2, Size: 25})
+
+		if err != nil || len(page.Items) != 25 || page.Total != 60 {
+			t.Fatalf("unexpected page: %d items, total %d, %v", len(page.Items), page.Total, err)
+		}
+		if page.Items[0].ID != ids[34] || page.Items[24].ID != ids[10] {
+			t.Errorf("expected the 26th to 50th of the sorted list, got %d..%d", page.Items[0].ID, page.Items[24].ID)
+		}
+		past, _ := repo.List(audit.Filter{Page: 9, Size: 25})
+		if len(past.Items) != 0 || past.Total != 60 {
+			t.Errorf("expected an empty page with total 60, got %d items, total %d", len(past.Items), past.Total)
+		}
+	})
+
+	t.Run("The summary counts the range and the previous period", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		now := activityDay(8, 12)
+		at := func(daysAgo int, extra time.Duration) time.Time {
+			return now.Add(-time.Duration(daysAgo)*24*time.Hour + extra)
+		}
+		add := func(when time.Time, mutate func(*audit.Event)) {
+			event := activityUserEvent(1, "one", when)
+			mutate(&event)
+			activityMustAppend(t, repo, event)
+		}
+		none := func(*audit.Event) {}
+		add(at(0, -time.Hour), none)
+		add(at(0, -2*time.Hour), func(e *audit.Event) { e.Outcome = audit.OutcomeFailed })
+		add(at(1, -time.Hour), func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(2)), Name: "two"}
+			e.Security = true
+		})
+		add(at(3, -time.Hour), func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorAPIKey, ID: activityPtr(uint32(9)), Name: "bot"}
+		})
+		add(at(6, -time.Hour), func(e *audit.Event) {
+			e.Actor = audit.AnonymousActor("x")
+			e.Outcome = audit.OutcomeFailed
+			e.Security = true
+		})
+		add(at(6, -2*time.Hour), func(e *audit.Event) { e.Actor = audit.SystemActor() })
+		for i := 0; i < 4; i++ {
+			add(at(8+i, 0), none)
+		}
+
+		summary, err := repo.Summary(audit.SummaryQuery{From: now.Add(-7 * 24 * time.Hour), To: now})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		if summary.Total != 6 || summary.PreviousTotal != 4 || summary.Failed != 2 || summary.Security != 2 {
+			t.Errorf("unexpected counts %+v", summary)
+		}
+		if summary.ActivePeople.Users != 2 || summary.ActivePeople.APIKeys != 1 {
+			t.Errorf("unexpected active people %+v", summary.ActivePeople)
+		}
+		wantTotal := []int{2, 0, 0, 1, 0, 1, 2}
+		if !reflect.DeepEqual(summary.Series.Total, wantTotal) {
+			t.Errorf("expected total series %v, got %v", wantTotal, summary.Series.Total)
+		}
+		if !reflect.DeepEqual(summary.Series.Failed, []int{1, 0, 0, 0, 0, 0, 1}) || !reflect.DeepEqual(summary.Series.Security, []int{1, 0, 0, 0, 0, 1, 0}) {
+			t.Errorf("unexpected failed %v or security %v series", summary.Series.Failed, summary.Series.Security)
+		}
+		if !reflect.DeepEqual(summary.Series.Active, []int{0, 0, 0, 1, 0, 1, 1}) {
+			t.Errorf("unexpected active series %v", summary.Series.Active)
+		}
+	})
+
+	t.Run("DeleteOlderThan removes only events before the cutoff", func(t *testing.T) {
+		repo := persistence.NewAuditEventRepository(openActivityDatabase(t))
+		now := activityDay(20, 12)
+		for _, days := range []int{100, 40, 31, 29, 1} {
+			activityMustAppend(t, repo, activityUserEvent(1, "a", now.Add(-time.Duration(days)*24*time.Hour)))
+		}
+
+		removed, err := repo.DeleteOlderThan(now.Add(-30 * 24 * time.Hour))
+
+		if err != nil || removed != 3 {
+			t.Fatalf("expected 3 removed, got %d, %v", removed, err)
+		}
+		page, _ := repo.List(audit.Filter{Page: 1, Size: 25})
+		if page.Total != 2 {
+			t.Errorf("expected 2 events left, got %d", page.Total)
+		}
+	})
+}
+
+func TestActivitySettingsPersistence(t *testing.T) {
+	t.Run("No row means the default", func(t *testing.T) {
+		repo := persistence.NewAuditSettingsRepository(openActivityDatabase(t))
+
+		settings, err := repo.Get()
+
+		if err != nil || settings.RetentionDays != 90 || settings.LastCleanupAt != nil || settings.LastCleanupRemoved != 0 {
+			t.Errorf("unexpected default %+v, %v", settings, err)
+		}
+	})
+
+	t.Run("The retention and the last cleanup are stored independently", func(t *testing.T) {
+		repo := persistence.NewAuditSettingsRepository(openActivityDatabase(t))
+		at := time.Date(2026, time.October, 6, 3, 0, 0, 0, time.UTC)
+
+		if err := repo.SaveLastCleanup(at, 142); err != nil {
+			t.Fatal(err)
+		}
+		settings, _ := repo.Get()
+		if settings.RetentionDays != 90 || settings.LastCleanupAt == nil || !settings.LastCleanupAt.Equal(at) || settings.LastCleanupRemoved != 142 {
+			t.Fatalf("unexpected settings %+v", settings)
+		}
+		if err := repo.SaveRetention(0); err != nil {
+			t.Fatal(err)
+		}
+		settings, _ = repo.Get()
+		if settings.RetentionDays != 0 || settings.LastCleanupRemoved != 142 {
+			t.Errorf("forever must be stored as 0 and keep the last cleanup, got %+v", settings)
+		}
+	})
+}
+
+func withoutIDs(ids []uint64, excluded ...uint64) []uint64 {
+	var kept []uint64
+	for _, id := range ids {
+		skip := false
+		for _, other := range excluded {
+			skip = skip || id == other
+		}
+		if !skip {
+			kept = append(kept, id)
+		}
+	}
+	return kept
+}

test/activity_recorder_test.go

@@ -0,0 +1,108 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestActivityRecorder(t *testing.T) {
+	t.Run("A failing repository does not fail the caller and the failure is logged", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.probe.appendErr = errDiskFull
+
+		h.recorder.Record(testCtx, activityValidEvent())
+
+		logs := h.logs.String()
+		if !strings.Contains(logs, "audit.test") || !strings.Contains(logs, "disk full") {
+			t.Errorf("expected a log line naming the write and the error, got %q", logs)
+		}
+	})
+
+	t.Run("A panicking repository does not crash the caller", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.probe.appendPanic = true
+
+		h.recorder.Record(testCtx, activityValidEvent())
+
+		if !strings.Contains(h.logs.String(), "panicked") {
+			t.Errorf("expected the panic to be logged, got %q", h.logs.String())
+		}
+	})
+
+	t.Run("The recorder fills the event from the audit context", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.now = time.Date(2026, time.October, 6, 14, 0, 0, 0, time.FixedZone("CEST", 2*3600))
+		ctx := audit.WithOrigin(testCtx, audit.Origin{
+			Actor:     audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(3)), Name: "marta"},
+			Source:    audit.SourceWeb,
+			IP:        "203.0.113.12",
+			UserAgent: "Mozilla/5.0 test",
+		})
+		event := audit.NewEvent("audit.test", audit.CategorySystem)
+
+		h.recorder.Record(ctx, event)
+
+		stored := h.all(t)
+		if len(stored) != 1 {
+			t.Fatalf("expected one event, got %d", len(stored))
+		}
+		got := stored[0]
+		if got.Actor.Type != audit.ActorUser || *got.Actor.ID != 3 || got.Actor.Name != "marta" || got.Source != audit.SourceWeb {
+			t.Errorf("unexpected actor or source %+v", got)
+		}
+		if got.IP == nil || *got.IP != "203.0.113.12" || got.UserAgent == nil || *got.UserAgent != "Mozilla/5.0 test" {
+			t.Errorf("unexpected ip or user agent %v %v", got.IP, got.UserAgent)
+		}
+		if !got.CreatedAt.Equal(h.now) || got.CreatedAt.Location() != time.UTC {
+			t.Errorf("expected created_at %v in UTC, got %v", h.now.UTC(), got.CreatedAt)
+		}
+	})
+
+	t.Run("Values already on the event are kept", func(t *testing.T) {
+		h := newActivityHarness(t)
+		ctx := audit.WithOrigin(testCtx, audit.Origin{Actor: audit.AnonymousActor("x"), Source: audit.SourceWeb, IP: "203.0.113.12", UserAgent: "ua"})
+		event := audit.NewEvent(audit.ActionCleanup, audit.CategorySystem)
+		event.Actor = audit.SystemActor()
+		event.Source = audit.SourceSystem
+
+		h.recorder.Record(ctx, event)
+
+		got := h.all(t)[0]
+		if got.Actor.Type != audit.ActorSystem || got.Source != audit.SourceSystem {
+			t.Errorf("the explicit actor and source must win, got %+v", got)
+		}
+	})
+
+	t.Run("An event outside the vocabulary is dropped and logged", func(t *testing.T) {
+		h := newActivityHarness(t)
+		event := activityValidEvent()
+		event.Category = "billing"
+
+		h.recorder.Record(testCtx, event)
+
+		if len(h.all(t)) != 0 || !strings.Contains(h.logs.String(), "dropped") {
+			t.Errorf("expected nothing stored and a log line, got %q", h.logs.String())
+		}
+	})
+
+	t.Run("Long names are bounded", func(t *testing.T) {
+		h := newActivityHarness(t)
+		event := activityValidEvent()
+		event.Target = audit.Target{Type: "article", ID: "1", Name: strings.Repeat("é", 400)}
+
+		h.recorder.Record(testCtx, event)
+
+		if got := h.all(t); len(got) != 1 || len([]rune(got[0].Target.Name)) != 255 {
+			t.Errorf("expected one event with a 255 character target name, got %+v", got)
+		}
+	})
+}
+
+func activityValidEvent() audit.Event {
+	event := audit.NewEvent("audit.test", audit.CategorySystem)
+	event.Actor = audit.SystemActor()
+	event.Source = audit.SourceSystem
+	return event
+}

test/activity_retention_test.go

@@ -0,0 +1,343 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/scheduler"
+	"RenewCMS/internal/infrastructure/useCases"
+	"context"
+	"errors"
+	"log"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestActivityRetentionUseCases(t *testing.T) {
+	ownerCtx := activityOwnerCtx
+
+	t.Run("The default is 90 days with no cleanup yet", func(t *testing.T) {
+		h := newActivityHarness(t)
+
+		settings, err := useCases.NewGetActivityRetentionUseCase(h.settings).GetActivityRetention()
+
+		if err != nil || settings.RetentionDays != 90 || settings.LastCleanupAt != nil || settings.LastCleanupRemoved != 0 {
+			t.Errorf("unexpected default %+v, %v", settings, err)
+		}
+	})
+
+	t.Run("The owner sets a valid period", func(t *testing.T) {
+		for _, days := range []int{30, 90, 365, 0} {
+			h := newActivityHarness(t)
+
+			settings, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(ownerCtx(), days)
+
+			if err != nil || settings.RetentionDays != days || h.settings.settings.RetentionDays != days {
+				t.Errorf("%d: unexpected result %+v, %v", days, settings, err)
+			}
+		}
+	})
+
+	t.Run("Any other value is refused and changes nothing", func(t *testing.T) {
+		for _, days := range []int{7, -1, 366} {
+			h := newActivityHarness(t)
+
+			_, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(ownerCtx(), days)
+
+			if !errors.Is(err, audit.ErrInvalidRetention) || h.settings.settings.RetentionDays != 90 || len(h.all(t)) != 0 {
+				t.Errorf("%d: expected a refusal, got %v", days, err)
+			}
+		}
+	})
+
+	t.Run("A change is recorded as a system event by the owner", func(t *testing.T) {
+		h := newActivityHarness(t)
+
+		_, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(ownerCtx(), 30)
+
+		events := h.all(t)
+		if err != nil || len(events) != 1 {
+			t.Fatalf("expected one event, got %d, %v", len(events), err)
+		}
+		event := events[0]
+		if event.Action != "system.activity_retention_changed" || event.Category != audit.CategorySystem || event.Actor.Name != "owner" || event.Source != audit.SourceWeb || event.Outcome != audit.OutcomeSuccess || event.Security {
+			t.Errorf("unexpected event %+v", event)
+		}
+		if event.Params["from"] != float64(90) || event.Params["to"] != float64(30) {
+			t.Errorf("unexpected params %v", event.Params)
+		}
+	})
+
+	t.Run("Setting the same value records nothing", func(t *testing.T) {
+		h := newActivityHarness(t)
+
+		settings, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(ownerCtx(), 90)
+
+		if err != nil || settings.RetentionDays != 90 || len(h.all(t)) != 0 || h.settings.retentionOK != 0 {
+			t.Errorf("expected no event and no write, got %v", err)
+		}
+	})
+
+	t.Run("A failing save is returned and records nothing", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.settings.saveErr = errRepositoryFailure
+
+		_, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(ownerCtx(), 30)
+
+		if !errors.Is(err, errRepositoryFailure) || len(h.all(t)) != 0 {
+			t.Errorf("expected the failure and no event, got %v", err)
+		}
+	})
+}
+
+func cleanupAt(day int, hour int, minute int) time.Time {
+	return time.Date(2026, time.October, day, hour, minute, 0, 0, time.UTC)
+}
+
+func activityOwnerCtx() context.Context {
+	return audit.WithOrigin(testCtx, audit.Origin{
+		Actor:  audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(1)), Name: "owner"},
+		Source: audit.SourceWeb,
+	})
+}
+
+func newCleanup(h *activityHarness) *useCases.CleanupActivityUseCase {
+	return useCases.NewCleanupActivityUseCase(h.probe, h.settings, h.recorder)
+}
+
+func TestActivityCleanupUseCase(t *testing.T) {
+	t.Run("The cleanup is due once a day at or after 03:00", func(t *testing.T) {
+		cases := []struct {
+			name string
+			last *time.Time
+			now  time.Time
+			ran  bool
+		}{
+			{"never at 02:59", nil, cleanupAt(6, 2, 59), false},
+			{"never at 03:00", nil, cleanupAt(6, 3, 0), true},
+			{"never at 14:00", nil, cleanupAt(6, 14, 0), true},
+			{"yesterday at 02:59", ptrTime(cleanupAt(5, 3, 0)), cleanupAt(6, 2, 59), false},
+			{"yesterday at 03:00", ptrTime(cleanupAt(5, 3, 0)), cleanupAt(6, 3, 0), true},
+			{"today at 04:00", ptrTime(cleanupAt(6, 3, 0)), cleanupAt(6, 4, 0), false},
+			{"tomorrow at 03:00", ptrTime(cleanupAt(6, 3, 0)), cleanupAt(7, 3, 0), true},
+		}
+		for _, c := range cases {
+			t.Run(c.name, func(t *testing.T) {
+				h := newActivityHarness(t)
+				h.settings.settings.LastCleanupAt = c.last
+				h.now = c.now
+
+				_, ran, err := newCleanup(h).Tick(c.now)
+
+				if err != nil || ran != c.ran {
+					t.Errorf("expected ran=%v, got %v, %v", c.ran, ran, err)
+				}
+			})
+		}
+	})
+
+	t.Run("Forever never runs", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.settings.settings.RetentionDays = 0
+
+		_, ran, err := newCleanup(h).Tick(cleanupAt(6, 3, 0))
+
+		if err != nil || ran || h.probe.deleteCalls != 0 {
+			t.Errorf("expected nothing to run, got ran=%v, %v, %d deletes", ran, err, h.probe.deleteCalls)
+		}
+	})
+
+	t.Run("The cutoff is now minus the retention days", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.settings.settings.RetentionDays = 30
+		now := cleanupAt(6, 3, 0)
+		h.now = now
+		var kept []uint64
+		for _, days := range []int{40, 31, 29, 1} {
+			id := h.seed(t, activityUserEvent(1, "a", now.Add(-time.Duration(days)*24*time.Hour))).ID
+			if days < 30 {
+				kept = append(kept, id)
+			}
+		}
+
+		result, ran, err := newCleanup(h).Tick(now)
+
+		if err != nil || !ran || result.Removed != 2 {
+			t.Fatalf("expected 2 removed, got %+v ran=%v %v", result, ran, err)
+		}
+		remaining := map[uint64]bool{}
+		for _, event := range h.all(t) {
+			remaining[event.ID] = true
+		}
+		for _, id := range kept {
+			if !remaining[id] {
+				t.Errorf("event %d should remain", id)
+			}
+		}
+		last := h.settings.settings
+		if last.LastCleanupAt == nil || !last.LastCleanupAt.Equal(now) || last.LastCleanupRemoved != 2 {
+			t.Errorf("unexpected last cleanup %+v", last)
+		}
+	})
+
+	t.Run("A cleanup that removes nothing still records the run and no event", func(t *testing.T) {
+		h := newActivityHarness(t)
+		now := cleanupAt(6, 3, 0)
+		h.now = now
+		h.seed(t, activityUserEvent(1, "a", now.Add(-24*time.Hour)))
+
+		result, ran, err := newCleanup(h).Tick(now)
+
+		if err != nil || !ran || result.Removed != 0 {
+			t.Fatalf("unexpected result %+v ran=%v %v", result, ran, err)
+		}
+		if h.settings.cleanupOK != 1 || h.settings.settings.LastCleanupAt == nil || !h.settings.settings.LastCleanupAt.Equal(now) || len(h.all(t)) != 1 {
+			t.Errorf("expected the run recorded without event, got %+v with %d events", h.settings.settings, len(h.all(t)))
+		}
+	})
+
+	t.Run("A cleanup that removes events records a system event after deleting", func(t *testing.T) {
+		h := newActivityHarness(t)
+		now := cleanupAt(6, 3, 0)
+		h.now = now
+		for i := 0; i < 142; i++ {
+			h.seed(t, activityUserEvent(1, "a", now.Add(-100*24*time.Hour)))
+		}
+
+		result, _, err := newCleanup(h).Tick(now)
+
+		events := h.all(t)
+		if err != nil || result.Removed != 142 || len(events) != 1 {
+			t.Fatalf("expected 142 removed and one event, got %+v, %d events, %v", result, len(events), err)
+		}
+		event := events[0]
+		if event.Action != "system.activity_cleanup" || event.Category != audit.CategorySystem || event.Actor.Type != audit.ActorSystem || event.Source != audit.SourceSystem || event.IP != nil || event.UserAgent != nil || event.Outcome != audit.OutcomeSuccess {
+			t.Errorf("unexpected event %+v", event)
+		}
+		if event.Params["removed"] != float64(142) {
+			t.Errorf("unexpected params %v", event.Params)
+		}
+	})
+
+	t.Run("A failing delete is retried at the next tick", func(t *testing.T) {
+		h := newActivityHarness(t)
+		now := cleanupAt(6, 3, 0)
+		h.now = now
+		h.probe.deleteErr = errRepositoryFailure
+		cleanup := newCleanup(h)
+
+		_, ran, err := cleanup.Tick(now)
+
+		if !errors.Is(err, errRepositoryFailure) || ran || h.settings.settings.LastCleanupAt != nil {
+			t.Fatalf("expected the failure without a recorded run, got ran=%v %v", ran, err)
+		}
+		h.probe.deleteErr = nil
+		_, ran, err = cleanup.Tick(now.Add(time.Hour))
+		if err != nil || !ran {
+			t.Errorf("expected the next tick to run, got ran=%v %v", ran, err)
+		}
+	})
+
+	t.Run("A failing save of the run is returned", func(t *testing.T) {
+		h := newActivityHarness(t)
+		h.settings.saveErr = errRepositoryFailure
+
+		_, ran, err := newCleanup(h).Tick(cleanupAt(6, 3, 0))
+
+		if !errors.Is(err, errRepositoryFailure) || ran {
+			t.Errorf("expected the failure, got ran=%v %v", ran, err)
+		}
+	})
+
+	t.Run("A shortened period applies at the next cleanup, not at the change", func(t *testing.T) {
+		h := newActivityHarness(t)
+		now := cleanupAt(6, 3, 0)
+		h.now = now
+		h.seed(t, activityUserEvent(1, "a", now.Add(-40*24*time.Hour)))
+
+		_, err := useCases.NewUpdateActivityRetentionUseCase(h.settings, h.recorder).UpdateActivityRetention(activityOwnerCtx(), 30)
+		if err != nil || len(h.all(t)) != 2 {
+			t.Fatalf("the change itself must remove nothing, got %d events, %v", len(h.all(t)), err)
+		}
+
+		result, _, _ := newCleanup(h).Tick(now)
+
+		if result.Removed != 1 {
+			t.Errorf("expected the old event removed at the next cleanup, got %+v", result)
+		}
+	})
+}
+
+type cleanupJobFake struct {
+	calls   chan time.Time
+	removed int
+	err     error
+}
+
+func (c *cleanupJobFake) Tick(now time.Time) (audit.CleanupResult, bool, error) {
+	c.calls <- now
+	return audit.CleanupResult{Removed: c.removed}, c.err == nil, c.err
+}
+
+func TestActivityCleanupScheduler(t *testing.T) {
+	start := func(job *cleanupJobFake) (chan time.Time, chan time.Time, *strings.Builder, context.CancelFunc, chan struct{}) {
+		ticks := make(chan time.Time, 4)
+		startup := make(chan time.Time, 1)
+		logs := &strings.Builder{}
+		runner := scheduler.NewCleanupRunner(job, func() time.Time { return cleanupAt(6, 3, 0) }, ticks, startup, log.New(logs, "", 0))
+		ctx, cancel := context.WithCancel(context.Background())
+		done := make(chan struct{})
+		go func() {
+			defer close(done)
+			runner.Run(ctx)
+		}()
+		return ticks, startup, logs, cancel, done
+	}
+
+	t.Run("The runner ticks the cleanup with the injected clock and logs the count", func(t *testing.T) {
+		job := &cleanupJobFake{calls: make(chan time.Time, 4), removed: 142}
+		ticks, _, logs, cancel, done := start(job)
+		defer func() { cancel(); <-done }()
+
+		ticks <- time.Time{}
+		select {
+		case got := <-job.calls:
+			if !got.Equal(cleanupAt(6, 3, 0)) {
+				t.Errorf("expected the injected clock, got %v", got)
+			}
+		case <-time.After(2 * time.Second):
+			t.Fatal("the job was never ticked")
+		}
+		cancel()
+		<-done
+		if !strings.Contains(logs.String(), "activity cleanup completed: removed=142") {
+			t.Errorf("unexpected log %q", logs.String())
+		}
+	})
+
+	t.Run("A failing tick is logged", func(t *testing.T) {
+		job := &cleanupJobFake{calls: make(chan time.Time, 4), err: errRepositoryFailure}
+		_, startup, logs, cancel, done := start(job)
+
+		startup <- time.Time{}
+		<-job.calls
+		cancel()
+		<-done
+
+		if !strings.Contains(logs.String(), "activity cleanup failed") || !strings.Contains(logs.String(), errRepositoryFailure.Error()) {
+			t.Errorf("unexpected log %q", logs.String())
+		}
+	})
+
+	t.Run("The scheduler stops with the process", func(t *testing.T) {
+		job := &cleanupJobFake{calls: make(chan time.Time, 4)}
+		_, _, _, cancel, done := start(job)
+
+		cancel()
+
+		select {
+		case <-done:
+		case <-time.After(2 * time.Second):
+			t.Fatal("the runner did not return after the context was cancelled")
+		}
+	})
+}

test/activity_support_test.go

@@ -0,0 +1,140 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/infrastructure/auditing"
+	persistence "RenewCMS/internal/infrastructure/persistence/repositories"
+	"bytes"
+	"context"
+	"errors"
+	"log"
+	"testing"
+	"time"
+)
+
+var testCtx = context.Background()
+
+var discardRecorder audit.Recorder = audit.Discard
+
+type activityProbeRepo struct {
+	inner       audit.Repository
+	appendErr   error
+	appendPanic bool
+	reads       int
+	listCalls   []audit.Filter
+	deleteErr   error
+	deleteCalls int
+	readErr     error
+}
+
+var _ audit.Repository = &activityProbeRepo{}
+
+func (p *activityProbeRepo) Append(event audit.Event) (audit.Event, error) {
+	if p.appendPanic {
+		panic("audit repository exploded")
+	}
+	if p.appendErr != nil {
+		return audit.Event{}, p.appendErr
+	}
+	return p.inner.Append(event)
+}
+
+func (p *activityProbeRepo) List(filter audit.Filter) (audit.Page, error) {
+	p.reads++
+	p.listCalls = append(p.listCalls, filter)
+	if p.readErr != nil {
+		return audit.Page{}, p.readErr
+	}
+	return p.inner.List(filter)
+}
+
+func (p *activityProbeRepo) Summary(query audit.SummaryQuery) (audit.Summary, error) {
+	p.reads++
+	if p.readErr != nil {
+		return audit.Summary{}, p.readErr
+	}
+	return p.inner.Summary(query)
+}
+
+func (p *activityProbeRepo) DeleteOlderThan(cutoff time.Time) (int, error) {
+	p.deleteCalls++
+	if p.deleteErr != nil {
+		return 0, p.deleteErr
+	}
+	return p.inner.DeleteOlderThan(cutoff)
+}
+
+type activitySettingsFake struct {
+	settings    audit.Settings
+	saveErr     error
+	retentionOK int
+	cleanupOK   int
+}
+
+var _ audit.SettingsRepository = &activitySettingsFake{}
+
+func newActivitySettingsFake() *activitySettingsFake {
+	return &activitySettingsFake{settings: audit.DefaultSettings()}
+}
+
+func (f *activitySettingsFake) Get() (audit.Settings, error) { return f.settings, nil }
+
+func (f *activitySettingsFake) SaveRetention(days int) error {
+	if f.saveErr != nil {
+		return f.saveErr
+	}
+	f.retentionOK++
+	f.settings.RetentionDays = days
+	return nil
+}
+
+func (f *activitySettingsFake) SaveLastCleanup(at time.Time, removed int) error {
+	if f.saveErr != nil {
+		return f.saveErr
+	}
+	f.cleanupOK++
+	f.settings.LastCleanupAt = &at
+	f.settings.LastCleanupRemoved = removed
+	return nil
+}
+
+type activityHarness struct {
+	probe    *activityProbeRepo
+	store    *persistence.AuditEventRepository
+	settings *activitySettingsFake
+	logs     *bytes.Buffer
+	now      time.Time
+	recorder *auditing.Recorder
+}
+
+func newActivityHarness(t *testing.T) *activityHarness {
+	t.Helper()
+	store := persistence.NewAuditEventRepository(openActivityDatabase(t))
+	h := &activityHarness{
+		probe:    &activityProbeRepo{inner: store},
+		store:    store,
+		settings: newActivitySettingsFake(),
+		logs:     &bytes.Buffer{},
+		now:      time.Date(2026, time.October, 6, 12, 0, 0, 0, time.UTC),
+	}
+	h.recorder = auditing.NewRecorder(h.probe, func() time.Time { return h.now }, log.New(h.logs, "", 0))
+	return h
+}
+
+func (h *activityHarness) clock() time.Time { return h.now }
+
+func (h *activityHarness) all(t *testing.T) []audit.Event {
+	t.Helper()
+	page, err := h.store.List(audit.Filter{Page: 1, Size: 1000})
+	if err != nil {
+		t.Fatalf("listing stored events failed: %v", err)
+	}
+	return page.Items
+}
+
+func (h *activityHarness) seed(t *testing.T, event audit.Event) audit.Event {
+	t.Helper()
+	return activityMustAppend(t, h.store, event)
+}
+
+var errDiskFull = errors.New("disk full")

test/activity_usecases_test.go

@@ -0,0 +1,491 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/apikey"
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/useCases"
+	"bytes"
+	"encoding/csv"
+	"errors"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+)
+
+type activityWorld struct {
+	*activityHarness
+	users    *mockUserRepo
+	articles *mockArticleRepo
+	images   *mockImageRepo
+	keys     *mockAPIKeyRepo
+	list     *useCases.ListActivityUseCase
+	summary  *useCases.GetActivitySummaryUseCase
+	export   *useCases.ExportActivityUseCase
+}
+
+func newActivityWorld(t *testing.T) *activityWorld {
+	t.Helper()
+	h := newActivityHarness(t)
+	w := &activityWorld{
+		activityHarness: h,
+		users:           newMockUserRepo(),
+		articles:        newMockArticleRepo(),
+		images:          newMockImageRepo(),
+		keys:            newMockAPIKeyRepo(),
+	}
+	w.users.users[1] = user.User{ID: 1, Username: "owner", IsVerified: true, Role: user.RoleOwner}
+	w.users.users[2] = user.User{ID: 2, Username: "admin", IsVerified: true, Role: user.RoleAdmin}
+	w.users.users[3] = user.User{ID: 3, Username: "marta", DisplayName: "Marta Alves", IsVerified: true, Role: "editor"}
+	w.list = useCases.NewListActivityUseCase(h.probe, w.users, w.articles, w.images, w.keys, h.clock)
+	w.summary = useCases.NewGetActivitySummaryUseCase(h.probe, h.clock)
+	w.export = useCases.NewExportActivityUseCase(h.probe, h.clock)
+	return w
+}
+
+func (w *activityWorld) seedAt(t *testing.T, ago time.Duration, mutate func(*audit.Event)) audit.Event {
+	t.Helper()
+	event := activityUserEvent(3, "Marta Alves", w.now.Add(-ago))
+	if mutate != nil {
+		mutate(&event)
+	}
+	return w.seed(t, event)
+}
+
+func TestActivityListUseCase(t *testing.T) {
+	const day = 24 * time.Hour
+
+	t.Run("Omitting the range means seven days", func(t *testing.T) {
+		w := newActivityWorld(t)
+		recent := w.seedAt(t, 2*day, nil)
+		w.seedAt(t, 10*day, nil)
+
+		page, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1})
+
+		if err != nil || len(page.Items) != 1 || page.Items[0].Event.ID != recent.ID {
+			t.Fatalf("expected only the recent event, got %+v, %v", page, err)
+		}
+		if page.Page != 1 || page.Size != 25 || page.Total != 1 {
+			t.Errorf("unexpected paging %d/%d/%d", page.Page, page.Size, page.Total)
+		}
+	})
+
+	t.Run("The ranges map to the documented windows", func(t *testing.T) {
+		cases := []struct {
+			name  string
+			query useCases.ActivityQuery
+			ago   time.Duration
+			found bool
+		}{
+			{"today keeps this morning", useCases.ActivityQuery{Range: "today"}, 11 * time.Hour, true},
+			{"today drops yesterday", useCases.ActivityQuery{Range: "today"}, 13 * time.Hour, false},
+			{"7d keeps six days", useCases.ActivityQuery{Range: "7d"}, 6 * day, true},
+			{"7d drops eight days", useCases.ActivityQuery{Range: "7d"}, 8 * day, false},
+			{"30d keeps twenty nine days", useCases.ActivityQuery{Range: "30d"}, 29 * day, true},
+			{"30d drops thirty one days", useCases.ActivityQuery{Range: "30d"}, 31 * day, false},
+			{"custom keeps the first day", useCases.ActivityQuery{Range: "custom", From: "2026-09-01", To: "2026-09-30"}, 35*day + 12*time.Hour, true},
+			{"custom keeps the end of the last day", useCases.ActivityQuery{Range: "custom", From: "2026-09-01", To: "2026-09-30"}, 5*day + 12*time.Hour + time.Second, true},
+			{"custom drops after the last day", useCases.ActivityQuery{Range: "custom", From: "2026-09-01", To: "2026-09-30"}, 5 * day, false},
+		}
+		for _, c := range cases {
+			t.Run(c.name, func(t *testing.T) {
+				w := newActivityWorld(t)
+				w.seedAt(t, c.ago, nil)
+
+				page, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1, Query: c.query})
+
+				if err != nil || (page.Total == 1) != c.found {
+					t.Errorf("expected found=%v, got total %d, %v", c.found, page.Total, err)
+				}
+			})
+		}
+	})
+
+	t.Run("Invalid values are refused before the repository is read", func(t *testing.T) {
+		queries := []useCases.ActivityQuery{
+			{Actor: "user:abc"}, {Actor: "user:-1"}, {Actor: "group:3"},
+			{Category: "billing"}, {Outcome: "maybe"}, {Security: "false"},
+			{Range: "year"}, {Range: "custom"},
+			{Range: "custom", From: "2026-09-30", To: "2026-09-01"},
+			{Range: "custom", From: "yesterday", To: "today"},
+			{Page: -1}, {Size: 10}, {Size: 200},
+		}
+		for i, query := range queries {
+			w := newActivityWorld(t)
+
+			_, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1, Query: query})
+
+			if !errors.Is(err, audit.ErrInvalidFilter) || w.probe.reads != 0 {
+				t.Errorf("query %d (%+v): expected ErrInvalidFilter without reading, got %v after %d reads", i, query, err, w.probe.reads)
+			}
+		}
+	})
+
+	t.Run("The outcome all lists both outcomes", func(t *testing.T) {
+		w := newActivityWorld(t)
+		w.seedAt(t, day, nil)
+		w.seedAt(t, day, func(e *audit.Event) { e.Outcome = audit.OutcomeFailed })
+
+		page, _ := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1, Query: useCases.ActivityQuery{Outcome: "all"}})
+
+		if page.Total != 2 {
+			t.Errorf("expected both outcomes, got %d", page.Total)
+		}
+	})
+
+	t.Run("A caller who is not owner or admin is scoped to its own events", func(t *testing.T) {
+		w := newActivityWorld(t)
+		w.seedAt(t, day, nil)
+		w.seedAt(t, day, func(e *audit.Event) {
+			e.Actor = audit.Actor{Type: audit.ActorUser, ID: activityPtr(uint32(2)), Name: "admin"}
+		})
+		w.seedAt(t, day, func(e *audit.Event) { e.Actor = audit.SystemActor() })
+
+		page, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 3})
+
+		if err != nil || page.Total != 1 || *page.Items[0].Event.Actor.ID != 3 {
+			t.Fatalf("expected only user 3's events, got %+v, %v", page, err)
+		}
+	})
+
+	t.Run("A scoped caller cannot ask for another actor", func(t *testing.T) {
+		cases := map[string]bool{"user:3": true, "user:2": false, "key:7": false, "system": false}
+		for actor, allowed := range cases {
+			w := newActivityWorld(t)
+
+			_, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 3, Query: useCases.ActivityQuery{Actor: actor}})
+
+			if allowed && err != nil {
+				t.Errorf("%s: expected success, got %v", actor, err)
+			}
+			if !allowed && !errors.Is(err, audit.ErrActorNotAllowed) {
+				t.Errorf("%s: expected ErrActorNotAllowed, got %v", actor, err)
+			}
+		}
+	})
+
+	t.Run("An unknown viewer is reported", func(t *testing.T) {
+		w := newActivityWorld(t)
+
+		_, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 99})
+
+		if !errors.Is(err, user.ErrUserNotFound) {
+			t.Errorf("expected ErrUserNotFound, got %v", err)
+		}
+	})
+
+	t.Run("target.exists is resolved when the list is read", func(t *testing.T) {
+		cases := []struct {
+			name   string
+			target audit.Target
+			seed   func(*activityWorld)
+			exists bool
+		}{
+			{"the article still exists", audit.Target{Type: "article", ID: "8", Name: "Spring release"}, func(w *activityWorld) { w.articles.articles[8] = article.Article{ID: 8} }, true},
+			{"the article was deleted", audit.Target{Type: "article", ID: "8", Name: "Spring release"}, func(w *activityWorld) {}, false},
+			{"the user was deleted", audit.Target{Type: "user", ID: "3", Name: "Marta Alves"}, func(w *activityWorld) { delete(w.users.users, 3) }, false},
+			{"the api key still exists", audit.Target{Type: "api_key", ID: "7", Name: "Deploy bot"}, func(w *activityWorld) { w.keys.keys[7] = apikey.APIKey{ID: 7} }, true},
+			{"the api key is unknown", audit.Target{Type: "api_key", ID: "7", Name: "Deploy bot"}, func(w *activityWorld) {}, false},
+		}
+		for _, c := range cases {
+			t.Run(c.name, func(t *testing.T) {
+				w := newActivityWorld(t)
+				c.seed(w)
+				w.seedAt(t, day, func(e *audit.Event) { e.Target = c.target })
+
+				page, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1})
+
+				if err != nil || len(page.Items) != 1 {
+					t.Fatalf("unexpected result %+v, %v", page, err)
+				}
+				if page.Items[0].TargetExists != c.exists || page.Items[0].Event.Target.Name != c.target.Name {
+					t.Errorf("expected exists=%v with the name kept, got %+v", c.exists, page.Items[0])
+				}
+			})
+		}
+	})
+
+	t.Run("A repository failure is returned", func(t *testing.T) {
+		w := newActivityWorld(t)
+		w.users.fail.failNext("Get")
+
+		_, err := w.list.ListActivity(useCases.ListActivityCommand{ViewerID: 1})
+
+		if !errors.Is(err, errRepositoryFailure) {
+			t.Errorf("expected the repository failure, got %v", err)
+		}
+	})
+}
+
+func TestActivitySummaryUseCase(t *testing.T) {
+	const day = 24 * time.Hour
+
+	t.Run("The summary of the last seven days compares with the previous period", func(t *testing.T) {
+		w := newActivityWorld(t)
+		for i := 0; i < 12; i++ {
+			i := i
+			w.seedAt(t, time.Duration(i)*12*time.Hour+time.Hour, func(e *audit.Event) {
+				if i < 3 {
+					e.Outcome = audit.OutcomeFailed
+				}
+				e.Security = i < 2
+				if i%2 == 1 {
+					e.Actor = audit.Actor{Type: audit.ActorAPIKey, ID: activityPtr(uint32(7)), Name: "bot"}
+				}
+			})
+		}
+		for i := 0; i < 10; i++ {
+			w.seedAt(t, 7*day+time.Duration(i)*time.Hour+time.Hour, nil)
+		}
+
+		summary, err := w.summary.GetActivitySummary(useCases.ActivityQuery{Range: "7d"})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		if summary.Total != 12 || summary.PreviousTotal != 10 || summary.Failed != 3 || summary.Security != 2 {
+			t.Errorf("unexpected counts %+v", summary)
+		}
+		if summary.ActivePeople.Users != 1 || summary.ActivePeople.APIKeys != 1 {
+			t.Errorf("unexpected people %+v", summary.ActivePeople)
+		}
+		sum := 0
+		for _, n := range summary.Series.Total {
+			sum += n
+		}
+		if len(summary.Series.Total) != 7 || len(summary.Series.Active) != 7 || len(summary.Series.Failed) != 7 || len(summary.Series.Security) != 7 || sum != 12 {
+			t.Errorf("unexpected series %+v", summary.Series)
+		}
+	})
+
+	t.Run("An empty log answers zeros", func(t *testing.T) {
+		w := newActivityWorld(t)
+
+		summary, err := w.summary.GetActivitySummary(useCases.ActivityQuery{})
+
+		if err != nil || summary.Total != 0 || summary.PreviousTotal != 0 || len(summary.Series.Total) != 7 {
+			t.Errorf("unexpected summary %+v, %v", summary, err)
+		}
+		for _, n := range append(append(summary.Series.Total, summary.Series.Active...), append(summary.Series.Failed, summary.Series.Security...)...) {
+			if n != 0 {
+				t.Errorf("expected only zeros, got %+v", summary.Series)
+			}
+		}
+	})
+
+	t.Run("A custom range compares with the seven days immediately before it", func(t *testing.T) {
+		w := newActivityWorld(t)
+		at := func(day int, month time.Month) {
+			w.seed(t, activityUserEvent(3, "a", time.Date(2026, month, day, 12, 0, 0, 0, time.UTC)))
+		}
+		at(1, time.September)
+		at(7, time.September)
+		at(8, time.September)
+		at(25, time.August)
+		at(31, time.August)
+		at(24, time.August)
+
+		summary, err := w.summary.GetActivitySummary(useCases.ActivityQuery{Range: "custom", From: "2026-09-01", To: "2026-09-07"})
+
+		if err != nil || summary.Total != 2 || summary.PreviousTotal != 2 {
+			t.Errorf("expected 2 and 2, got %+v, %v", summary, err)
+		}
+	})
+
+	t.Run("An invalid range is refused", func(t *testing.T) {
+		w := newActivityWorld(t)
+
+		_, err := w.summary.GetActivitySummary(useCases.ActivityQuery{Range: "year"})
+
+		if !errors.Is(err, audit.ErrInvalidFilter) || w.probe.reads != 0 {
+			t.Errorf("expected ErrInvalidFilter without reading, got %v", err)
+		}
+	})
+}
+
+func exportToString(t *testing.T, w *activityWorld, query useCases.ActivityQuery) string {
+	t.Helper()
+	prepared, err := w.export.Prepare(query)
+	if err != nil {
+		t.Fatalf("prepare failed: %v", err)
+	}
+	var out bytes.Buffer
+	if err := prepared.WriteCSV(&out); err != nil {
+		t.Fatalf("write failed: %v", err)
+	}
+	return out.String()
+}
+
+func TestActivityExportUseCase(t *testing.T) {
+	t.Run("The file has the header and one row per event, newest first", func(t *testing.T) {
+		w := newActivityWorld(t)
+		for i := 1; i <= 3; i++ {
+			w.seedAt(t, time.Duration(i)*time.Hour, func(e *audit.Event) { e.Action = fmt.Sprintf("article.edit%d", i) })
+		}
+
+		rows, err := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{}))).ReadAll()
+
+		if err != nil || len(rows) != 4 {
+			t.Fatalf("unexpected rows %v, %v", rows, err)
+		}
+		if strings.Join(rows[0], ",") != "when,actor,action,target,outcome,source,ip" {
+			t.Errorf("unexpected header %v", rows[0])
+		}
+		if rows[1][2] != "article.edit1" || rows[3][2] != "article.edit3" {
+			t.Errorf("expected newest first, got %v", rows)
+		}
+	})
+
+	t.Run("A row holds the documented columns only", func(t *testing.T) {
+		w := newActivityWorld(t)
+		w.seed(t, func() audit.Event {
+			event := activityUserEvent(3, "Marta Alves", time.Date(2026, time.October, 6, 10, 42, 18, 0, time.UTC))
+			event.Target = audit.Target{Type: "article", ID: "8", Name: "Spring release"}
+			event.IP = activityPtr("203.0.113.12")
+			event.UserAgent = activityPtr("Chrome 129 on Windows")
+			event.Changes = []audit.Change{{Field: "online", Kind: audit.ChangeText, Before: activityPtr("false"), After: activityPtr("true")}}
+			return event
+		}())
+
+		file := exportToString(t, w, useCases.ActivityQuery{})
+
+		want := "2026-10-06T10:42:18Z,Marta Alves,article.publish,Spring release,success,web,203.0.113.12\n"
+		if !strings.HasSuffix(file, want) {
+			t.Errorf("expected the row %q, got %q", want, file)
+		}
+		if strings.Contains(file, "Chrome") || strings.Contains(file, "false") {
+			t.Errorf("the file must hold no user agent and no changes: %q", file)
+		}
+	})
+
+	t.Run("Cells that a spreadsheet would evaluate are neutralised", func(t *testing.T) {
+		cases := []struct {
+			column string
+			value  string
+			cell   string
+		}{
+			{"actor", "=cmd", "'=cmd"},
+			{"target", "+1+1", "'+1+1"},
+			{"target", "-2", "'-2"},
+			{"actor", "@SUM(A1)", "'@SUM(A1)"},
+			{"target", "Spring release", "Spring release"},
+			{"target", "a=b", "a=b"},
+		}
+		for _, c := range cases {
+			w := newActivityWorld(t)
+			w.seedAt(t, time.Hour, func(e *audit.Event) {
+				if c.column == "actor" {
+					e.Actor.Name = c.value
+				} else {
+					e.Target = audit.Target{Type: "article", ID: "1", Name: c.value}
+				}
+			})
+
+			rows, _ := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{}))).ReadAll()
+
+			index := 1
+			if c.column == "target" {
+				index = 3
+			}
+			if rows[1][index] != c.cell {
+				t.Errorf("%s %q: expected %q, got %q", c.column, c.value, c.cell, rows[1][index])
+			}
+		}
+	})
+
+	t.Run("Commas, quotes and newlines are quoted and keep one row", func(t *testing.T) {
+		w := newActivityWorld(t)
+		name := "Hello, \"world\"\nsecond line"
+		w.seedAt(t, time.Hour, func(e *audit.Event) { e.Target = audit.Target{Type: "article", ID: "1", Name: name} })
+
+		file := exportToString(t, w, useCases.ActivityQuery{})
+
+		if !strings.Contains(file, "\"Hello, \"\"world\"\"\nsecond line\"") {
+			t.Errorf("the cell is not quoted with doubled quotes: %q", file)
+		}
+		rows, err := csv.NewReader(strings.NewReader(file)).ReadAll()
+		if err != nil || len(rows) != 2 || rows[1][3] != name {
+			t.Errorf("expected one data row holding the name, got %v, %v", rows, err)
+		}
+	})
+
+	t.Run("The filters apply and paging is ignored", func(t *testing.T) {
+		w := newActivityWorld(t)
+		for i := 0; i < 60; i++ {
+			failed := i < 8
+			w.seedAt(t, time.Duration(i+1)*time.Minute, func(e *audit.Event) {
+				if failed {
+					e.Outcome = audit.OutcomeFailed
+				}
+			})
+		}
+
+		rows, _ := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{Outcome: "failed", Page: 2, Size: 25}))).ReadAll()
+
+		if len(rows) != 9 {
+			t.Errorf("expected the header and 8 failed rows, got %d lines", len(rows))
+		}
+	})
+
+	t.Run("A system event has an empty ip cell", func(t *testing.T) {
+		w := newActivityWorld(t)
+		w.seedAt(t, time.Hour, func(e *audit.Event) { e.Actor = audit.SystemActor(); e.Source = audit.SourceSystem })
+
+		rows, _ := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{}))).ReadAll()
+
+		if rows[1][6] != "" || rows[1][1] != "System" {
+			t.Errorf("unexpected row %v", rows[1])
+		}
+	})
+
+	t.Run("An invalid filter is refused before anything is prepared", func(t *testing.T) {
+		w := newActivityWorld(t)
+
+		_, err := w.export.Prepare(useCases.ActivityQuery{Outcome: "maybe"})
+
+		if !errors.Is(err, audit.ErrInvalidFilter) || w.probe.reads != 0 {
+			t.Errorf("expected ErrInvalidFilter without reading, got %v", err)
+		}
+	})
+
+	t.Run("A large export is read in batches", func(t *testing.T) {
+		w := newActivityWorld(t)
+		for i := 0; i < 1200; i++ {
+			w.seedAt(t, time.Duration(i+1)*time.Second, nil)
+		}
+
+		rows, err := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{}))).ReadAll()
+
+		if err != nil || len(rows) != 1201 {
+			t.Fatalf("expected 1200 rows plus the header, got %d, %v", len(rows), err)
+		}
+		if len(w.probe.listCalls) < 2 {
+			t.Errorf("expected several paged reads, got %d", len(w.probe.listCalls))
+		}
+		for _, call := range w.probe.listCalls {
+			if call.Size == 0 || call.Size >= 1200 {
+				t.Errorf("every read must be a bounded page, got size %d", call.Size)
+			}
+		}
+	})
+
+	t.Run("An export that fills whole batches stops without an extra read", func(t *testing.T) {
+		for _, c := range []struct{ events, reads int }{{500, 1}, {1000, 2}} {
+			w := newActivityWorld(t)
+			for i := 0; i < c.events; i++ {
+				w.seedAt(t, time.Duration(i+1)*time.Second, nil)
+			}
+
+			rows, err := csv.NewReader(strings.NewReader(exportToString(t, w, useCases.ActivityQuery{}))).ReadAll()
+
+			if err != nil || len(rows) != c.events+1 {
+				t.Fatalf("%d events: expected %d rows, got %d, %v", c.events, c.events+1, len(rows), err)
+			}
+			if len(w.probe.listCalls) != c.reads {
+				t.Errorf("%d events: expected %d reads, got %d", c.events, c.reads, len(w.probe.listCalls))
+			}
+		}
+	})
+}

test/activity_validation_test.go

@@ -0,0 +1,92 @@
+package test
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"errors"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+func validActivityEvent() audit.Event {
+	event := audit.NewEvent("article.publish", audit.CategoryArticles)
+	event.Source = audit.SourceWeb
+	event.Actor = audit.Actor{Type: audit.ActorUser, Name: "marta"}
+	return event
+}
+
+func TestActivityEventValidation(t *testing.T) {
+	long := func(n int) *string { value := strings.Repeat("x", n); return &value }
+	cases := []struct {
+		name   string
+		mutate func(*audit.Event)
+		valid  bool
+	}{
+		{"complete event", func(e *audit.Event) {}, true},
+		{"empty action", func(e *audit.Event) { e.Action = "" }, false},
+		{"action at the limit", func(e *audit.Event) { e.Action = strings.Repeat("a", 64) }, true},
+		{"action over the limit", func(e *audit.Event) { e.Action = strings.Repeat("a", 65) }, false},
+		{"unknown category", func(e *audit.Event) { e.Category = "nope" }, false},
+		{"unknown outcome", func(e *audit.Event) { e.Outcome = "nope" }, false},
+		{"unknown source", func(e *audit.Event) { e.Source = "nope" }, false},
+		{"unknown actor type", func(e *audit.Event) { e.Actor.Type = "nope" }, false},
+		{"failure reason at the limit", func(e *audit.Event) { e.FailureReason = long(255) }, true},
+		{"failure reason over the limit", func(e *audit.Event) { e.FailureReason = long(256) }, false},
+		{"unknown change kind", func(e *audit.Event) { e.Changes = []audit.Change{{Field: "a", Kind: "nope"}} }, false},
+		{"body change", func(e *audit.Event) { e.Changes = []audit.Change{{Field: "a", Kind: audit.ChangeBody}} }, true},
+	}
+	for _, c := range cases {
+		event := validActivityEvent()
+		c.mutate(&event)
+
+		err := event.Validate()
+
+		if c.valid && err != nil {
+			t.Errorf("%s: expected valid, got %v", c.name, err)
+		}
+		if !c.valid && !errors.Is(err, audit.ErrInvalidEvent) {
+			t.Errorf("%s: expected ErrInvalidEvent, got %v", c.name, err)
+		}
+	}
+
+	t.Run("Names are cut to 255 characters", func(t *testing.T) {
+		event := validActivityEvent()
+		event.Actor.Name = strings.Repeat("é", 256)
+		event.Target.Name = strings.Repeat("é", 255)
+
+		cut := event.Truncated()
+
+		if len([]rune(cut.Actor.Name)) != 255 || len([]rune(cut.Target.Name)) != 255 {
+			t.Errorf("unexpected lengths %d and %d", len([]rune(cut.Actor.Name)), len([]rune(cut.Target.Name)))
+		}
+	})
+
+	t.Run("The discard recorder accepts events silently", func(t *testing.T) {
+		audit.Discard.Record(testCtx, validActivityEvent())
+	})
+}
+
+func TestActivityHandlerErrorMapping(t *testing.T) {
+	t.Run("A signed-in user who no longer exists is unauthorised", func(t *testing.T) {
+		e := newActivityHTTPEnv(t, 1000)
+
+		rec := e.get("/v1/activity", asUser(e, 99))
+
+		if rec.Code != http.StatusUnauthorized {
+			t.Errorf("expected 401, got %d", rec.Code)
+		}
+	})
+
+	t.Run("A storage failure is a plain 500", func(t *testing.T) {
+		for _, path := range []string{"/v1/activity", "/v1/activity/summary", "/v1/activity/export"} {
+			e := newActivityHTTPEnv(t, 1000)
+			e.probe.readErr = errors.New("storage down")
+
+			rec := e.get(path, asUser(e, activityOwnerID))
+
+			if path != "/v1/activity/export" && rec.Code != http.StatusInternalServerError {
+				t.Errorf("%s: expected 500, got %d", path, rec.Code)
+			}
+		}
+	})
+}

test/api_keys_http_test.go

@@ -6,6 +6,7 @@ import (
 	validator "RenewCMS/api/pkg/validator"
 	"RenewCMS/internal/domain/apikey"
 	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/audit"
 	"RenewCMS/internal/domain/image"
 	"RenewCMS/internal/domain/update"
 	"RenewCMS/internal/domain/user"
@@ -15,6 +16,8 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
+	"io"
+	"log"
 	"net/http"
 	"net/http/httptest"
 	"regexp"
@@ -45,6 +48,7 @@ type apiKeyEnv struct {
 	articles  *mockArticleRepo
 	images    *mockImageRepo
 	invites   *inviteFakeRepo
+	mail      *mockMailRepo
 	feed      *fakeReleaseFeed
 	updates   *fakeUpdateStore
 	token     *jwtauth.JWTAuth
@@ -57,6 +61,11 @@ type apiKeyEnv struct {
 }
 
 func newAPIKeyEnv(t *testing.T) *apiKeyEnv {
+	t.Helper()
+	return newAPIKeyEnvRecording(t, discardRecorder)
+}
+
+func newAPIKeyEnvRecording(t *testing.T, recorder audit.Recorder) *apiKeyEnv {
 	t.Helper()
 	validator.InitValidator()
 
@@ -89,40 +98,47 @@ func newAPIKeyEnv(t *testing.T) *apiKeyEnv {
 	clock := func() time.Time { return env.now }
 	hasher := &stubHasher{}
 	mail := newMockMailRepo()
+	env.mail = mail
 	renderer := &fakeBodyRenderer{}
+	mergeMedia := useCases.NewMergeMediaUseCase(env.images, env.articles, newMockImageStorage(), recorder)
+	purgeSettings := newMockPurgeSettingsRepo()
+	restartJobs := &fakeJobStore{}
 	env.container = &api.UseCases{
 		Token:                       env.token,
-		CreateArticleUseCase:        useCases.NewCreateArticleUseCase(env.articles, renderer),
+		CreateArticleUseCase:        useCases.NewCreateArticleUseCase(env.articles, renderer, recorder),
 		GetArticleUseCase:           useCases.NewGetArticleUseCase(env.articles, renderer),
 		ListArticlesUseCase:         useCases.NewListArticlesUseCase(env.articles, renderer),
-		UpdateArticleUseCase:        useCases.NewUpdateArticleUseCase(env.articles, renderer),
+		UpdateArticleUseCase:        useCases.NewUpdateArticleUseCase(env.articles, renderer, recorder),
-		DeleteArticleUseCase:        useCases.NewDeleteArticleUseCase(env.articles),
+		DeleteArticleUseCase:        useCases.NewDeleteArticleUseCase(env.articles, recorder),
 		GetUserUseCase:              useCases.NewGetUserUseCase(env.users),
-		CreateUserUseCase:           useCases.NewCreateUserUseCase(env.users, hasher, mail, "https://cms.example.com"),
+		CreateUserUseCase:           useCases.NewCreateUserUseCase(env.users, hasher, mail, "https://cms.example.com", recorder),
-		AuthenticateUserUseCase:     useCases.NewAuthenticateUserUseCase(env.users, hasher),
+		AuthenticateUserUseCase:     useCases.NewAuthenticateUserUseCase(env.users, hasher, recorder),
-		VerifyUserUseCase:           useCases.NewVerifyUserUseCase(env.users, hasher),
+		VerifyUserUseCase:           useCases.NewVerifyUserUseCase(env.users, hasher, recorder),
 		CancelRegistrationUseCase:   useCases.NewCancelRegistrationUseCase(env.users),
-		RequestPasswordResetUseCase: useCases.NewRequestPasswordResetUseCase(env.users, hasher, mail, "https://cms.example.com"),
+		RequestPasswordResetUseCase: useCases.NewRequestPasswordResetUseCase(env.users, hasher, mail, "https://cms.example.com", recorder),
-		ResetPasswordUseCase:        useCases.NewResetPasswordUseCase(env.users, hasher, env.keys, clock),
+		ResetPasswordUseCase:        useCases.NewResetPasswordUseCase(env.users, hasher, env.keys, clock, recorder),
-		UpdateUserProfileUseCase:    useCases.NewUpdateUserProfileUseCase(env.users),
+		UpdateUserProfileUseCase:    useCases.NewUpdateUserProfileUseCase(env.users, recorder),
-		CreateInviteUseCase:         useCases.NewCreateInviteUseCase(env.users, env.invites, hasher, mail, "https://cms.example.com"),
+		CreateInviteUseCase:         useCases.NewCreateInviteUseCase(env.users, env.invites, hasher, mail, "https://cms.example.com", recorder),
-		CancelInviteUseCase:         useCases.NewCancelInviteUseCase(env.invites),
+		CancelInviteUseCase:         useCases.NewCancelInviteUseCase(env.invites, recorder),
-		RenewInviteUseCase:          useCases.NewRenewInviteUseCase(env.users, env.invites, hasher, mail, "https://cms.example.com"),
+		RenewInviteUseCase:          useCases.NewRenewInviteUseCase(env.users, env.invites, hasher, mail, "https://cms.example.com", recorder),
 		ListUsersAndInvitesUseCase:  useCases.NewListUsersAndInvitesUseCase(env.users, env.invites),
 		GetInviteUseCase:            useCases.NewGetInviteUseCase(env.invites, hasher),
-		AcceptInviteUseCase:         useCases.NewAcceptInviteUseCase(env.users, env.invites, hasher),
+		AcceptInviteUseCase:         useCases.NewAcceptInviteUseCase(env.users, env.invites, hasher, recorder),
-		CreateImageUseCase:          useCases.NewCreateImageUseCase(env.images, newMockImageStorage()),
+		CreateImageUseCase:          useCases.NewCreateImageUseCase(env.images, newMockImageStorage(), recorder),
 		ListMediaUseCase:            useCases.NewListMediaUseCase(env.images, env.articles, env.users),
-		RenameMediaUseCase:          useCases.NewRenameMediaUseCase(env.images),
+		RenameMediaUseCase:          useCases.NewRenameMediaUseCase(env.images, recorder),
-		DeleteMediaUseCase:          useCases.NewDeleteMediaUseCase(env.images, newMockImageStorage()),
+		DeleteMediaUseCase:          useCases.NewDeleteMediaUseCase(env.images, newMockImageStorage(), recorder),
-		MergeMediaUseCase:           useCases.NewMergeMediaUseCase(env.images, env.articles, newMockImageStorage()),
+		MergeMediaUseCase:           mergeMedia,
+		RunPurgeUseCase:             useCases.NewRunPurgeUseCase(env.images, env.articles, mergeMedia, purgeSettings, clock, log.New(io.Discard, "", 0), recorder),
+		RequestRestartUseCase:       useCases.NewRequestRestartUseCase(env.updates, restartJobs, &fakeHelperDetector{installed: true}, &fakeResultStore{}, &fakeRestartRequestStore{}, apiKeyRunningVersion, clock, recorder),
 		GetMediaUsageUseCase:        useCases.NewGetMediaUsageUseCase(env.images, env.articles),
 		GetSettingsUseCase:          useCases.NewGetSettingsUseCase(apiKeyRunningVersion),
+		GetActivityRetentionUseCase: useCases.NewGetActivityRetentionUseCase(newActivitySettingsFake()),
 		GetUpdateStatusUseCase:      newUpdateStatusUseCase(env.updates, &fakeJobStore{}, &fakeHelperDetector{}, apiKeyRunningVersion),
-		CheckForUpdateUseCase:       useCases.NewCheckForUpdateUseCase(env.feed, env.updates, apiKeyRunningVersion, clock),
+		CheckForUpdateUseCase:       useCases.NewCheckForUpdateUseCase(env.feed, env.updates, apiKeyRunningVersion, clock, recorder),
-		CreateAPIKeyUseCase:         useCases.NewCreateAPIKeyUseCase(env.keys, env.generator, clock),
+		CreateAPIKeyUseCase:         useCases.NewCreateAPIKeyUseCase(env.keys, env.generator, clock, recorder),
 		ListAPIKeysUseCase:          useCases.NewListAPIKeysUseCase(env.keys, env.users, clock),
-		RevokeAPIKeyUseCase:         useCases.NewRevokeAPIKeyUseCase(env.keys, env.users, clock),
+		RevokeAPIKeyUseCase:         useCases.NewRevokeAPIKeyUseCase(env.keys, env.users, clock, recorder),
 		AuthenticateAPIKeyUseCase:   useCases.NewAuthenticateAPIKeyUseCase(env.keys, env.generator, env.users, clock),
 	}
 	router := chi.NewRouter()

test/api_keys_test.go

@@ -221,9 +221,9 @@ func TestSHA256KeyGenerator(t *testing.T) {
 func TestCreateAPIKeyUseCase(t *testing.T) {
 	t.Run("Use case: creating a key hashes it and stores no plaintext", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
-		uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock)
+		uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock, discardRecorder)
 
-		created, err := uc.CreateAPIKey(useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci"})
+		created, err := uc.CreateAPIKey(testCtx, useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci"})
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -248,9 +248,9 @@ func TestCreateAPIKeyUseCase(t *testing.T) {
 	t.Run("An expiry that is not in the future is refused and nothing is stored", func(t *testing.T) {
 		for name, expiry := range map[string]time.Time{"in the past": apiKeyUnitNow.Add(-time.Hour), "exactly now": apiKeyUnitNow} {
 			repo := newMockAPIKeyRepo()
-			uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock)
+			uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock, discardRecorder)
 
-			_, err := uc.CreateAPIKey(useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci", ExpiresAt: &expiry})
+			_, err := uc.CreateAPIKey(testCtx, useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci", ExpiresAt: &expiry})
 			if !errors.Is(err, apikey.ErrExpiryNotInFuture) {
 				t.Errorf("%s: expected ErrExpiryNotInFuture, got %v", name, err)
 			}
@@ -263,9 +263,9 @@ func TestCreateAPIKeyUseCase(t *testing.T) {
 	t.Run("A repository failure is returned", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		repo.fail.failNext("Create")
-		uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock)
+		uc := useCases.NewCreateAPIKeyUseCase(repo, &stubKeyGenerator{raw: "rcms_fake", prefix: "rcms_fake"}, apiKeyUnitClock, discardRecorder)
 
-		if _, err := uc.CreateAPIKey(useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci"}); !errors.Is(err, errRepositoryFailure) {
+		if _, err := uc.CreateAPIKey(testCtx, useCases.CreateAPIKeyCommand{UserID: 2, Name: "ci"}); !errors.Is(err, errRepositoryFailure) {
 			t.Errorf("expected the repository failure, got %v", err)
 		}
 	})
@@ -486,9 +486,9 @@ func TestRevokeAPIKeyUseCase(t *testing.T) {
 	t.Run("A creator revokes their own key at the clock's now", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		stored := seedStubKey(repo, "rcms_a", nil)
-		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock)
+		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock, discardRecorder)
 
-		if err := uc.RevokeAPIKey(2, stored.ID); err != nil {
+		if err := uc.RevokeAPIKey(testCtx, 2, stored.ID); err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
 		if got := repo.keys[stored.ID].RevokedAt; got == nil || !got.Equal(apiKeyUnitNow) {
@@ -499,9 +499,9 @@ func TestRevokeAPIKeyUseCase(t *testing.T) {
 	t.Run("Another admin gets not found and the key stays active", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		stored := seedStubKey(repo, "rcms_a", nil)
-		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock)
+		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock, discardRecorder)
 
-		if err := uc.RevokeAPIKey(3, stored.ID); !errors.Is(err, apikey.ErrAPIKeyNotFound) {
+		if err := uc.RevokeAPIKey(testCtx, 3, stored.ID); !errors.Is(err, apikey.ErrAPIKeyNotFound) {
 			t.Errorf("expected ErrAPIKeyNotFound, got %v", err)
 		}
 		if repo.keys[stored.ID].RevokedAt != nil || repo.revokeCalls != 0 {
@@ -512,9 +512,9 @@ func TestRevokeAPIKeyUseCase(t *testing.T) {
 	t.Run("The owner revokes any key", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		stored := seedStubKey(repo, "rcms_a", func(k *apikey.APIKey) { k.UserID = 3 })
-		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock)
+		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock, discardRecorder)
 
-		if err := uc.RevokeAPIKey(1, stored.ID); err != nil {
+		if err := uc.RevokeAPIKey(testCtx, 1, stored.ID); err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
 		if repo.keys[stored.ID].RevokedAt == nil {
@@ -526,9 +526,9 @@ func TestRevokeAPIKeyUseCase(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		original := apiKeyUnitNow.Add(-time.Hour)
 		stored := seedStubKey(repo, "rcms_a", func(k *apikey.APIKey) { k.RevokedAt = &original })
-		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock)
+		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock, discardRecorder)
 
-		if err := uc.RevokeAPIKey(2, stored.ID); err != nil {
+		if err := uc.RevokeAPIKey(testCtx, 2, stored.ID); err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
 		if got := repo.keys[stored.ID].RevokedAt; got == nil || !got.Equal(original) {
@@ -539,16 +539,16 @@ func TestRevokeAPIKeyUseCase(t *testing.T) {
 	t.Run("An unknown key, an unknown requester and repository failures are returned", func(t *testing.T) {
 		repo := newMockAPIKeyRepo()
 		stored := seedStubKey(repo, "rcms_a", nil)
-		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock)
+		uc := useCases.NewRevokeAPIKeyUseCase(repo, apiKeyUnitUsers(), apiKeyUnitClock, discardRecorder)
 
-		if err := uc.RevokeAPIKey(2, 999); !errors.Is(err, apikey.ErrAPIKeyNotFound) {
+		if err := uc.RevokeAPIKey(testCtx, 2, 999); !errors.Is(err, apikey.ErrAPIKeyNotFound) {
 			t.Errorf("expected ErrAPIKeyNotFound, got %v", err)
 		}
-		if err := uc.RevokeAPIKey(99, stored.ID); !errors.Is(err, user.ErrUserNotFound) {
+		if err := uc.RevokeAPIKey(testCtx, 99, stored.ID); !errors.Is(err, user.ErrUserNotFound) {
 			t.Errorf("expected ErrUserNotFound, got %v", err)
 		}
 		repo.fail.failNext("Revoke")
-		if err := uc.RevokeAPIKey(2, stored.ID); !errors.Is(err, errRepositoryFailure) {
+		if err := uc.RevokeAPIKey(testCtx, 2, stored.ID); !errors.Is(err, errRepositoryFailure) {
 			t.Errorf("expected the repository failure, got %v", err)
 		}
 	})
@@ -566,9 +566,9 @@ func TestResetPasswordRevokesAPIKeys(t *testing.T) {
 		keys := newMockAPIKeyRepo()
 		seedStubKey(keys, "rcms_a", func(k *apikey.APIKey) { k.UserID = 2 })
 		other := seedStubKey(keys, "rcms_c", func(k *apikey.APIKey) { k.UserID = 3 })
-		uc := useCases.NewResetPasswordUseCase(resetUser(apiKeyUnitNow.Add(time.Hour)), &stubHasher{}, keys, apiKeyUnitClock)
+		uc := useCases.NewResetPasswordUseCase(resetUser(apiKeyUnitNow.Add(time.Hour)), &stubHasher{}, keys, apiKeyUnitClock, discardRecorder)
 
-		if err := uc.ResetPassword("dev@example.com", "reset-code-1", "newpassword1"); err != nil {
+		if err := uc.ResetPassword(testCtx, "dev@example.com", "reset-code-1", "newpassword1"); err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
 		if len(keys.revokeAllCalls) != 1 || keys.revokeAllCalls[0].userId != 2 || !keys.revokeAllCalls[0].at.Equal(apiKeyUnitNow) {
@@ -594,9 +594,9 @@ func TestResetPasswordRevokesAPIKeys(t *testing.T) {
 		for _, tc := range cases {
 			t.Run(tc.name, func(t *testing.T) {
 				keys := newMockAPIKeyRepo()
-				uc := useCases.NewResetPasswordUseCase(resetUser(tc.expiration), &stubHasher{}, keys, apiKeyUnitClock)
+				uc := useCases.NewResetPasswordUseCase(resetUser(tc.expiration), &stubHasher{}, keys, apiKeyUnitClock, discardRecorder)
 
-				if err := uc.ResetPassword(tc.email, tc.code, "newpassword1"); !errors.Is(err, tc.want) {
+				if err := uc.ResetPassword(testCtx, tc.email, tc.code, "newpassword1"); !errors.Is(err, tc.want) {
 					t.Errorf("expected %v, got %v", tc.want, err)
 				}
 				if len(keys.revokeAllCalls) != 0 {
@@ -610,14 +610,14 @@ func TestResetPasswordRevokesAPIKeys(t *testing.T) {
 		keys := newMockAPIKeyRepo()
 		users := resetUser(apiKeyUnitNow.Add(time.Hour))
 		users.fail.failNext("ResetPassword")
-		uc := useCases.NewResetPasswordUseCase(users, &stubHasher{}, keys, apiKeyUnitClock)
+		uc := useCases.NewResetPasswordUseCase(users, &stubHasher{}, keys, apiKeyUnitClock, discardRecorder)
-		if err := uc.ResetPassword("dev@example.com", "reset-code-1", "newpassword1"); !errors.Is(err, errRepositoryFailure) {
+		if err := uc.ResetPassword(testCtx, "dev@example.com", "reset-code-1", "newpassword1"); !errors.Is(err, errRepositoryFailure) {
 			t.Errorf("expected the repository failure, got %v", err)
 		}
 
 		hashErr := errors.New("hash failed")
-		uc = useCases.NewResetPasswordUseCase(resetUser(apiKeyUnitNow.Add(time.Hour)), &stubHasher{hashErr: hashErr}, keys, apiKeyUnitClock)
+		uc = useCases.NewResetPasswordUseCase(resetUser(apiKeyUnitNow.Add(time.Hour)), &stubHasher{hashErr: hashErr}, keys, apiKeyUnitClock, discardRecorder)
-		if err := uc.ResetPassword("dev@example.com", "reset-code-1", "newpassword1"); !errors.Is(err, hashErr) {
+		if err := uc.ResetPassword(testCtx, "dev@example.com", "reset-code-1", "newpassword1"); !errors.Is(err, hashErr) {
 			t.Errorf("expected the hash error, got %v", err)
 		}
 		if len(keys.revokeAllCalls) != 0 {
@@ -629,9 +629,9 @@ func TestResetPasswordRevokesAPIKeys(t *testing.T) {
 		keys := newMockAPIKeyRepo()
 		keys.fail.failNext("RevokeAllByUser")
 		users := resetUser(apiKeyUnitNow.Add(time.Hour))
-		uc := useCases.NewResetPasswordUseCase(users, &stubHasher{}, keys, apiKeyUnitClock)
+		uc := useCases.NewResetPasswordUseCase(users, &stubHasher{}, keys, apiKeyUnitClock, discardRecorder)
 
-		err := uc.ResetPassword("dev@example.com", "reset-code-1", "newpassword1")
+		err := uc.ResetPassword(testCtx, "dev@example.com", "reset-code-1", "newpassword1")
 		if !errors.Is(err, errRepositoryFailure) {
 			t.Errorf("expected the revoke failure, got %v", err)
 		}

test/article_body_format_test.go

@@ -43,11 +43,11 @@ const (
 func newBodyFormatRouter(articleRepo *mockArticleRepo, userRepo *mockUserRepo, renderer domainArticle.BodyRenderer, token *jwtauth.JWTAuth) *chi.Mux {
 	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
 	articleHandler := article.NewHandler(
-		useCases.NewCreateArticleUseCase(articleRepo, renderer),
+		useCases.NewCreateArticleUseCase(articleRepo, renderer, discardRecorder),
 		useCases.NewGetArticleUseCase(articleRepo, renderer),
 		useCases.NewListArticlesUseCase(articleRepo, renderer),
-		useCases.NewDeleteArticleUseCase(articleRepo),
+		useCases.NewDeleteArticleUseCase(articleRepo, discardRecorder),
-		useCases.NewUpdateArticleUseCase(articleRepo, renderer),
+		useCases.NewUpdateArticleUseCase(articleRepo, renderer, discardRecorder),
 		getUserUseCase,
 	)
 

test/article_publishing_http_test.go

@@ -23,11 +23,11 @@ func newArticlePublishingRouter(articleRepo *mockArticleRepo, token *jwtauth.JWT
 	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
 
 	articleHandler := article.NewHandler(
-		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		useCases.NewGetArticleUseCase(articleRepo, &fakeBodyRenderer{}),
 		useCases.NewListArticlesUseCase(articleRepo, &fakeBodyRenderer{}),
-		useCases.NewDeleteArticleUseCase(articleRepo),
+		useCases.NewDeleteArticleUseCase(articleRepo, discardRecorder),
-		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		getUserUseCase,
 	)
 

test/article_test.go

@@ -148,11 +148,11 @@ var _ article.Repository = &mockArticleRepo{}
 
 func TestCreateArticle(t *testing.T) {
 	repo := newMockArticleRepo()
-	uc := useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{})
+	uc := useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{}, discardRecorder)
 
 	t.Run("Valid Title", func(t *testing.T) {
 		cmd := useCases.CreateArticleCommand{Title: "Valid Title", Body: "Content"}
-		res, err := uc.CreateArticle(cmd)
+		res, err := uc.CreateArticle(testCtx, cmd)
 		if err != nil {
 			t.Fatalf("Expected no error, got %v", err)
 		}
@@ -163,7 +163,7 @@ func TestCreateArticle(t *testing.T) {
 
 	t.Run("Short Title", func(t *testing.T) {
 		cmd := useCases.CreateArticleCommand{Title: "Ab", Body: "Content"}
-		_, err := uc.CreateArticle(cmd)
+		_, err := uc.CreateArticle(testCtx, cmd)
 		if !errors.Is(err, article.ErrInvalidTitle) {
 			t.Errorf("Expected ErrInvalidTitle")
 		}

test/article_title_rules_test.go

@@ -26,11 +26,11 @@ func newArticleTitleRulesRouter(repo *mockArticleRepo, token *jwtauth.JWTAuth) *
 	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
 
 	articleHandler := article.NewHandler(
-		useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{}),
+		useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{}, discardRecorder),
 		useCases.NewGetArticleUseCase(repo, &fakeBodyRenderer{}),
 		useCases.NewListArticlesUseCase(repo, &fakeBodyRenderer{}),
-		useCases.NewDeleteArticleUseCase(repo),
+		useCases.NewDeleteArticleUseCase(repo, discardRecorder),
-		useCases.NewUpdateArticleUseCase(repo, &fakeBodyRenderer{}),
+		useCases.NewUpdateArticleUseCase(repo, &fakeBodyRenderer{}, discardRecorder),
 		getUserUseCase,
 	)
 
@@ -87,10 +87,10 @@ func TestArticleTitleRunesInUseCase(t *testing.T) {
 	for _, tc := range cases {
 		t.Run(fmt.Sprintf("rune_count_%d", tc.runeCount), func(t *testing.T) {
 			repo := newMockArticleRepo()
-			uc := useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{})
+			uc := useCases.NewCreateArticleUseCase(repo, &fakeBodyRenderer{}, discardRecorder)
 
 			title := strings.Repeat("\U0001F600", tc.runeCount)
-			result, err := uc.CreateArticle(useCases.CreateArticleCommand{Title: title, Body: "Some body text"})
+			result, err := uc.CreateArticle(testCtx, useCases.CreateArticleCommand{Title: title, Body: "Some body text"})
 
 			if tc.created {
 				if err != nil {

test/articles_list_http_test.go

@@ -20,11 +20,11 @@ func newArticlesListRouter(articleRepo *mockArticleRepo, token *jwtauth.JWTAuth)
 	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
 
 	articleHandler := article.NewHandler(
-		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		useCases.NewGetArticleUseCase(articleRepo, &fakeBodyRenderer{}),
 		useCases.NewListArticlesUseCase(articleRepo, &fakeBodyRenderer{}),
-		useCases.NewDeleteArticleUseCase(articleRepo),
+		useCases.NewDeleteArticleUseCase(articleRepo, discardRecorder),
-		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		getUserUseCase,
 	)
 

test/cancel_pending_registration_http_test.go

@@ -19,12 +19,12 @@ func newCancelRegistrationRouter(userRepo *mockUserRepo, mailRepo *mockMailRepo,
 	hasher := &stubHasher{}
 	loginHandler := auth.NewLoginHandler(
 		token,
-		useCases.NewCreateUserUseCase(userRepo, hasher, mailRepo, "https://cms.example.com"),
+		useCases.NewCreateUserUseCase(userRepo, hasher, mailRepo, "https://cms.example.com", discardRecorder),
-		useCases.NewAuthenticateUserUseCase(userRepo, hasher),
+		useCases.NewAuthenticateUserUseCase(userRepo, hasher, discardRecorder),
 		true,
 	)
 	verificationHandler := auth.NewVerificationHandler(
-		useCases.NewVerifyUserUseCase(userRepo, hasher),
+		useCases.NewVerifyUserUseCase(userRepo, hasher, discardRecorder),
 		useCases.NewCancelRegistrationUseCase(userRepo),
 		true,
 	)

test/container_update_guidance_http_test.go

@@ -52,17 +52,18 @@ func newContainerHarness(t *testing.T, container bool, helperInstalled bool) *co
 		Platform:       rig.platform,
 		FeedURL:        downloadFeedURL,
 		Now:            now,
+		Recorder:       discardRecorder,
 	})
 	routes := &api.UseCases{
 		Token:                      token,
 		GetUserUseCase:             useCases.NewGetUserUseCase(newUpdateUserRepo()),
 		GetUpdateStatusUseCase:     useCases.NewGetUpdateStatusUseCase(rig.store, rig.jobs, helper, rig.results, rig.requests, updateRunning, container, now),
-		CheckForUpdateUseCase:      useCases.NewCheckForUpdateUseCase(feed, rig.store, updateRunning, now),
+		CheckForUpdateUseCase:      useCases.NewCheckForUpdateUseCase(feed, rig.store, updateRunning, now, discardRecorder),
 		StartUpdateDownloadUseCase: start,
-		RequestRestartUseCase:      useCases.NewRequestRestartUseCase(rig.store, rig.jobs, helper, rig.results, rig.requests, updateRunning, now),
+		RequestRestartUseCase:      useCases.NewRequestRestartUseCase(rig.store, rig.jobs, helper, rig.results, rig.requests, updateRunning, now, discardRecorder),
 	}
 	return &containerHarness{
-		updateHarness: &updateHarness{router: api.NewSystemRouter(routes), token: token, feed: feed, store: rig.store},
+		updateHarness: &updateHarness{router: api.NewSystemRouter(routes, nil), token: token, feed: feed, store: rig.store},
 		fetcher:       rig.fetcher,
 		requests:      rig.requests,
 		jobs:          rig.jobs,

test/edit_article_body_http_test.go

@@ -24,11 +24,11 @@ func newEditArticleBodyRouter(articleRepo *mockArticleRepo, token *jwtauth.JWTAu
 	getUserUseCase := useCases.NewGetUserUseCase(userRepo)
 
 	articleHandler := article.NewHandler(
-		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewCreateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		useCases.NewGetArticleUseCase(articleRepo, &fakeBodyRenderer{}),
 		useCases.NewListArticlesUseCase(articleRepo, &fakeBodyRenderer{}),
-		useCases.NewDeleteArticleUseCase(articleRepo),
+		useCases.NewDeleteArticleUseCase(articleRepo, discardRecorder),
-		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}),
+		useCases.NewUpdateArticleUseCase(articleRepo, &fakeBodyRenderer{}, discardRecorder),
 		getUserUseCase,
 	)