feat: Deleting games associated with matches deletes them

test/db_tests/aggregates/match_test.dart

@@ -366,5 +366,55 @@ void main() {
       expect(match.group, isNotNull);
       expect(match.group!.id, testGroup1.id);
     });
+
+    test('getMatchCountByGame() works correctly', () async {
+      var count = await database.matchDao.getMatchCountByGame(
+        gameId: testGame.id,
+      );
+      expect(count, 0);
+
+      await database.matchDao.addMatch(match: testMatch1);
+      count = await database.matchDao.getMatchCountByGame(gameId: testGame.id);
+      expect(count, 1);
+
+      await database.matchDao.addMatch(match: testMatch2);
+      count = await database.matchDao.getMatchCountByGame(gameId: testGame.id);
+      expect(count, 2);
+    });
+
+    test('getMatchCountByGame() returns 0 for non-existent game', () async {
+      final count = await database.matchDao.getMatchCountByGame(
+        gameId: 'non-existent-game-id',
+      );
+      expect(count, 0);
+    });
+
+    test('deleteMatchesByGame() deletes all matches for a game', () async {
+      await database.matchDao.addMatch(match: testMatch1);
+      await database.matchDao.addMatch(match: testMatch2);
+
+      var count = await database.matchDao.getMatchCountByGame(
+        gameId: testGame.id,
+      );
+      expect(count, 2);
+
+      final deletedCount = await database.matchDao.deleteMatchesByGame(
+        gameId: testGame.id,
+      );
+      expect(deletedCount, 2);
+
+      count = await database.matchDao.getMatchCountByGame(gameId: testGame.id);
+      expect(count, 0);
+
+      final allMatches = await database.matchDao.getAllMatches();
+      expect(allMatches, isEmpty);
+    });
+
+    test('deleteMatchesByGame() returns 0 for non-existent game', () async {
+      final deletedCount = await database.matchDao.deleteMatchesByGame(
+        gameId: 'non-existent-game-id',
+      );
+      expect(deletedCount, 0);
+    });
   });
 }