feat: setup logs retention by max file size

internal/domain/audit/auditSettings.go

@@ -7,6 +7,9 @@ const (
 	ForeverRetentionDays = 0
 	CleanupHour          = 3
 	KeepRecentHours      = 24
+	NoSizeLimitGB        = 0
+	BytesPerGB           = int64(1) << 30
+	RowOverheadBytes     = int64(64)
 )
 
 func RetentionOptions() []int {
@@ -22,8 +25,23 @@ func ValidateRetentionDays(days int) error {
 	return ErrInvalidRetention
 }
 
+func SizeOptions() []int {
+	return []int{NoSizeLimitGB, 1, 5, 10, 25, 50}
+}
+
+func ValidateRetentionMaxGB(maxGB int) error {
+	for _, option := range SizeOptions() {
+		if option == maxGB {
+			return nil
+		}
+	}
+	return ErrInvalidRetention
+}
+
 type Settings struct {
 	RetentionDays      int        `json:"activity_retention_days"`
+	RetentionMaxGB     int        `json:"activity_retention_max_gb"`
+	LogSizeBytes       int64      `json:"activity_log_size_bytes"`
 	LastCleanupAt      *time.Time `json:"activity_last_cleanup_at"`
 	LastCleanupRemoved int        `json:"activity_last_cleanup_removed"`
 	NextCleanupAt      *time.Time `json:"activity_next_cleanup_at"`
@@ -33,6 +51,14 @@ func DefaultSettings() Settings {
 	return Settings{RetentionDays: DefaultRetentionDays}
 }
 
+func (s Settings) HasRetentionLimit() bool {
+	return s.RetentionDays != ForeverRetentionDays || s.RetentionMaxGB != NoSizeLimitGB
+}
+
+func (s Settings) MaxLogSizeBytes() int64 {
+	return int64(s.RetentionMaxGB) * BytesPerGB
+}
+
 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) {
@@ -43,7 +69,7 @@ func (s Settings) CleanupDue(now time.Time) bool {
 
 func (s Settings) WithNextCleanup(now time.Time) Settings {
 	s.NextCleanupAt = nil
-	if s.RetentionDays == ForeverRetentionDays {
+	if !s.HasRetentionLimit() {
 		return s
 	}
 	next := time.Date(now.Year(), now.Month(), now.Day(), CleanupHour, 0, 0, 0, now.Location())
@@ -62,6 +88,10 @@ func ClampCutoff(now time.Time, cutoff time.Time) time.Time {
 	return cutoff
 }
 
+func GuardCutoff(now time.Time) time.Time {
+	return ClampCutoff(now, now)
+}
+
 func RetentionCutoff(now time.Time, retentionDays int) time.Time {
 	return ClampCutoff(now, now.Add(-time.Duration(retentionDays)*24*time.Hour))
 }