实现增量扫描

internal/repository/library.go

@@ -76,14 +76,34 @@ func (r *LibraryRepository) Delete(id int) error {
 	}
 	defer tx.Rollback()
 
-	// Delete the library — CASCADE removes media_files and songs automatically
 	_, err = tx.Exec("DELETE FROM libraries WHERE id = ?", id)
 	if err != nil {
 		return err
 	}
 
-	// Clean up orphan albums (no songs reference them)
-	_, err = tx.Exec(`
+	if err := cleanupOrphansTx(tx); err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}
+
+func (r *LibraryRepository) CleanupOrphans() error {
+	tx, err := r.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	if err := cleanupOrphansTx(tx); err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}
+
+func cleanupOrphansTx(tx *sql.Tx) error {
+	_, err := tx.Exec(`
 		DELETE FROM albums WHERE id NOT IN (
 			SELECT DISTINCT album_id FROM songs WHERE album_id IS NOT NULL
 		)
@@ -92,7 +112,6 @@ func (r *LibraryRepository) Delete(id int) error {
 		return err
 	}
 
-	// Clean up orphan artists (no songs and no albums reference them)
 	_, err = tx.Exec(`
 		DELETE FROM artists WHERE id NOT IN (
 			SELECT DISTINCT artist_id FROM songs WHERE artist_id IS NOT NULL
@@ -104,5 +123,5 @@ func (r *LibraryRepository) Delete(id int) error {
 		return err
 	}
 
-	return tx.Commit()
+	return nil
 }