refac: article reads, story delete, no leaks, stored SEO status, rate limit, cleanup (%site%, article repo split, old lang repos, one default per site rule to domain)

internal/infrastructure/useCases/UpdateSiteLanguages.go

@@ -65,10 +65,8 @@ func (u *UpdateSiteLanguagesUseCase) Update(ctx context.Context, command UpdateS
 		if err != nil {
 			return err
 		}
-		if !localization.SameRows(before, after) {
-			if err := tx.Localization.Replace(found.ID, after); err != nil {
-				return err
-			}
+		if err := replaceLanguages(tx, found.ID, before, after); err != nil {
+			return err
 		}
 		view, err = readSiteLanguages(tx.Localization, found)
 		return err
@@ -87,19 +85,26 @@ func (u *UpdateSiteLanguagesUseCase) Update(ctx context.Context, command UpdateS
 	return view, nil
 }
 
-func languageChanges(before []localization.Row, after []localization.Row) []audit.Change {
-	changes := []audit.Change{}
-	changes = audit.AppendTextChange(changes, audit.FieldDefaultLanguage, defaultTag(before), defaultTag(after))
-	return audit.AppendTextChange(changes, audit.FieldLanguages, languagesLabel(before), languagesLabel(after))
+func replaceLanguages(tx transaction.Repositories, siteID uint32, before []localization.Row, after []localization.Row) error {
+	if localization.SameRows(before, after) {
+		return nil
+	}
+	if err := localization.RequireSingleDefault(after); err != nil {
+		return err
+	}
+	if err := tx.Localization.Replace(siteID, after); err != nil {
+		return err
+	}
+	if localization.DefaultTag(before) == localization.DefaultTag(after) {
+		return nil
+	}
+	return tx.ArticleSEO.MarkSiteSEOStale(siteID)
 }
 
-func defaultTag(rows []localization.Row) string {
-	for _, row := range rows {
-		if row.IsDefault {
-			return row.Tag
-		}
-	}
-	return ""
+func languageChanges(before []localization.Row, after []localization.Row) []audit.Change {
+	changes := []audit.Change{}
+	changes = audit.AppendTextChange(changes, audit.FieldDefaultLanguage, localization.DefaultTag(before), localization.DefaultTag(after))
+	return audit.AppendTextChange(changes, audit.FieldLanguages, languagesLabel(before), languagesLabel(after))
 }
 
 func languagesLabel(rows []localization.Row) string {