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)
 );

backend/database/sql/schemas/search_index.sql

@@ -0,0 +1,8 @@
+CREATE VIRTUAL TABLE IF NOT EXISTS search_index USING fts5(
+    file_path,
+    title,
+    artist,
+    album,
+    content='',
+    tokenize='unicode61 remove_diacritics 2'
+);