Fix album persistence by passing artist DB ID directly to PersistAlbum

internal/metadata/service.go

@@ -110,15 +110,20 @@ func (s *MetadataService) PersistArtist(ctx context.Context, album *metadataPb.A
 }
 
 func (s *MetadataService) PersistAlbum(ctx context.Context, album *metadataPb.Album, state database.MonitorState) {
-	artistID := ""
-	if len(album.GetArtists()) > 0 {
-		a, err := s.artists.GetByExternalID(ctx, album.GetArtists()[0].GetArtist().GetId())
-		if err == nil {
-			artistID = a.ID
+	s.PersistAlbumForArtist(ctx, album, "", state)
+}
+
+func (s *MetadataService) PersistAlbumForArtist(ctx context.Context, album *metadataPb.Album, artistDBID string, state database.MonitorState) {
+	if artistDBID == "" {
+		if len(album.GetArtists()) > 0 {
+			a, err := s.artists.GetByExternalID(ctx, album.GetArtists()[0].GetArtist().GetId())
+			if err == nil {
+				artistDBID = a.ID
+			}
 		}
 	}
 
-	if artistID == "" {
+	if artistDBID == "" {
 		log.Trace().Str("album", album.GetTitle()).Msg("skipping album persist, no artist in DB")
 		return
 	}
@@ -135,7 +140,7 @@ func (s *MetadataService) PersistAlbum(ctx context.Context, album *metadataPb.Al
 
 	err := s.albums.Create(ctx, &database.Album{
 		ExternalID:   album.GetId(),
-		ArtistID:     artistID,
+		ArtistID:     artistDBID,
 		Title:        album.GetTitle(),
 		AlbumType:    album.GetAlbumType(),
 		TotalTracks:  int(album.GetTotalTracks()),