perf(library): trim startup lookup index

lib/providers/local_library_provider.dart

@@ -33,7 +33,6 @@ class LocalLibraryState {
   final int excludedDownloadedCount;
   final Set<String> _trackKeySet;
   final Set<String> _isrcSet;
-  final Map<String, String> _filePathById;
 
   LocalLibraryState({
     this.isScanning = false,
@@ -50,10 +49,8 @@ class LocalLibraryState {
     this.excludedDownloadedCount = 0,
     Set<String>? trackKeySet,
     Set<String>? isrcSet,
-    Map<String, String>? filePathById,
   }) : _trackKeySet = trackKeySet ?? const <String>{},
-       _isrcSet = isrcSet ?? const <String>{},
-       _filePathById = filePathById ?? const <String, String>{};
+       _isrcSet = isrcSet ?? const <String>{};
 
   bool hasIsrc(String isrc) => _isrcSet.contains(isrc);
 
@@ -62,8 +59,6 @@ class LocalLibraryState {
     return _trackKeySet.contains(key);
   }
 
-  String? filePathForId(String id) => _filePathById[id];
-
   bool existsInLibrary({String? isrc, String? trackName, String? artistName}) {
     if (isrc != null && isrc.isNotEmpty && hasIsrc(isrc)) {
       return true;
@@ -89,7 +84,6 @@ class LocalLibraryState {
     int? excludedDownloadedCount,
     Set<String>? trackKeySet,
     Set<String>? isrcSet,
-    Map<String, String>? filePathById,
   }) {
     return LocalLibraryState(
       isScanning: isScanning ?? this.isScanning,
@@ -107,7 +101,6 @@ class LocalLibraryState {
           excludedDownloadedCount ?? this.excludedDownloadedCount,
       trackKeySet: trackKeySet ?? _trackKeySet,
       isrcSet: isrcSet ?? _isrcSet,
-      filePathById: filePathById ?? _filePathById,
     );
   }
 }
@@ -190,7 +183,6 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
         excludedDownloadedCount: excludedDownloadedCount,
         trackKeySet: lookupIndex.matchKeys,
         isrcSet: lookupIndex.isrcs,
-        filePathById: lookupIndex.filePathById,
       );
       _log.i(
         'Loaded local library summary: $count items, lastScannedAt: '
@@ -227,7 +219,6 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
       excludedDownloadedCount: excludedDownloadedCount,
       trackKeySet: index.matchKeys,
       isrcSet: index.isrcs,
-      filePathById: index.filePathById,
     );
     _hasLoadedFromDatabase = true;
     _isLoaded = true;

lib/services/library_database.dart

@@ -208,12 +208,24 @@ class LocalLibraryAlbumGroup {
 class LocalLibraryLookupIndex {
   final Set<String> isrcs;
   final Set<String> matchKeys;
-  final Map<String, String> filePathById;
 
   const LocalLibraryLookupIndex({
     this.isrcs = const <String>{},
     this.matchKeys = const <String>{},
-    this.filePathById = const <String, String>{},
+  });
+}
+
+class LocalLibraryBatchLookupRequest {
+  final String? id;
+  final String? isrc;
+  final String trackName;
+  final String artistName;
+
+  const LocalLibraryBatchLookupRequest({
+    this.id,
+    this.isrc,
+    required this.trackName,
+    required this.artistName,
   });
 }
 
@@ -1644,18 +1656,10 @@ class LibraryDatabase {
 
   Future<LocalLibraryLookupIndex> getLookupIndex() async {
     final db = await database;
-    final rows = await db.rawQuery(
-      'SELECT id, file_path, isrc, match_key FROM library',
-    );
+    final rows = await db.rawQuery('SELECT isrc, match_key FROM library');
     final isrcs = <String>{};
     final matchKeys = <String>{};
-    final filePathById = <String, String>{};
     for (final row in rows) {
-      final id = row['id'] as String?;
-      final filePath = row['file_path'] as String?;
-      if (id != null && id.isNotEmpty && filePath != null) {
-        filePathById[id] = filePath;
-      }
       final isrc = row['isrc'] as String?;
       if (isrc != null && isrc.isNotEmpty) {
         isrcs.add(isrc);
@@ -1668,7 +1672,6 @@ class LibraryDatabase {
     return LocalLibraryLookupIndex(
       isrcs: Set<String>.unmodifiable(isrcs),
       matchKeys: Set<String>.unmodifiable(matchKeys),
-      filePathById: Map<String, String>.unmodifiable(filePathById),
     );
   }