feat: games with match associations cant be deleted

lib/data/dao/game_dao.dart

@@ -176,4 +176,25 @@ class GameDao extends DatabaseAccessor<AppDatabase> with _$GameDaoMixin {
     final rowsAffected = await query.go();
     return rowsAffected > 0;
   }
+
+  /// Retrieves all games with their respective match counts.
+  /// Returns a list of tuples (Game, matchCount).
+  Future<List<(Game, int)>> getGameUsage() async {
+    final games = await getAllGames();
+
+    final results = <(Game, int)>[];
+
+    for (final game in games) {
+      final matchCount =
+          await (selectOnly(db.matchTable)
+                ..where(db.matchTable.gameId.equals(game.id))
+                ..addColumns([db.matchTable.id.count()]))
+              .map((row) => row.read(db.matchTable.id.count()))
+              .getSingle();
+
+      results.add((game, matchCount ?? 0));
+    }
+
+    return results;
+  }
 }