playlist phantom track matching added, updated search queries for efficiency

backend/database/sql/schemas/audio_files.sql

@@ -9,6 +9,7 @@ CREATE TABLE IF NOT EXISTS audio_files (
   channels int NOT NULL DEFAULT 0,
   bitrate int NOT NULL DEFAULT 0,
   file_size int NOT NULL DEFAULT 0,
+  basename text NOT NULL DEFAULT '',
   FOREIGN KEY(file_type_id) REFERENCES file_types(id),
   FOREIGN KEY(recording_id) REFERENCES recordings(id)
 );