fix: prevent initialization if previously done for blacklist

backend/blacklist/repository.go

@@ -16,6 +16,7 @@ type SourceRepository interface {
 	GetSources(ctx context.Context, excludeCustom bool) ([]database.Source, error)
 	GetSourceByName(ctx context.Context, name string) (*database.Source, error)
 	GetSourceByNameAndURL(ctx context.Context, name, url string) (*database.Source, error)
+	GetSourceExists(ctx context.Context, name, url string) bool
 	CreateOrUpdateSource(ctx context.Context, source *database.Source) error
 	UpdateSourceName(ctx context.Context, oldName, newName, url string) error
 	UpdateSourceLastUpdated(ctx context.Context, url string, timestamp time.Time) error
@@ -113,6 +114,19 @@ func (r *repository) GetSourceByNameAndURL(ctx context.Context, name, url string
 	return &source, nil
 }
 
+func (r *repository) GetSourceExists(ctx context.Context, name, url string) bool {
+	var count int64
+	result := r.db.WithContext(ctx).Model(&database.Source{}).
+		Where("name = ? AND url = ?", name, url).
+		Count(&count)
+
+	if result.Error != nil || count == 0 {
+		return false
+	}
+
+	return count > 0
+}
+
 func (r *repository) CreateOrUpdateSource(ctx context.Context, source *database.Source) error {
 	result := r.db.WithContext(ctx).Where(database.Source{Name: source.Name, URL: source.URL}).FirstOrCreate(source)
 	if result.Error != nil {

backend/blacklist/service.go

@@ -94,7 +94,9 @@ func (s *Service) initialize(ctx context.Context) error {
 		return fmt.Errorf("failed to count domains: %w", err)
 	}
 
-	if count == 0 {
+	previouslyInitialized := s.repository.GetSourceExists(ctx, "Custom", "")
+
+	if count == 0 && !previouslyInitialized {
 		log.Info("No domains in blacklist. Running initialization...")
 		if err := s.initializeBlockedDomains(ctx); err != nil {
 			return fmt.Errorf("failed to initialize blocked domains: %w", err)