changed genre scanning to parse multiple genres, updated db to accommodate.

backend/library/rescan.go

@@ -102,6 +102,12 @@ func (l *Library) clearLibraryTables() error {
 		)
 	}
 
+	if err := txq.DeleteAllRecordingGenres(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear recording genres: %w", err,
+		)
+	}
+
 	if err := txq.DeleteAllReleaseGroupRecordings(l.ctx); err != nil {
 		return fmt.Errorf(
 			"could not clear release group recordings: %w", err,
@@ -152,6 +158,12 @@ func (l *Library) clearLibraryTables() error {
 		)
 	}
 
+	if err := txq.DeleteAllGenres(l.ctx); err != nil {
+		return fmt.Errorf(
+			"could not clear genres: %w", err,
+		)
+	}
+
 	if err := tx.Commit(); err != nil {
 		return fmt.Errorf(
 			"could not commit library clear transaction: %w", err,