create and update dao's

lib/data/dao/user_dao.dart

@@ -0,0 +1,26 @@
+import 'package:game_tracker/data/database.dart';
+import 'package:drift/drift.dart';
+
+extension UserDao on AppDatabase {
+  Future<List<UserTableData>> getAllUsers() async {
+    return await select(userTable).get();
+  }
+
+  Future<UserTableData> getUserById(String id) async {
+    return await (select(userTable)..where((u) => u.id.equals(id))).getSingle();
+  }
+
+  Future<void> addUser(String id, String name) async {
+    await into(userTable).insert(UserTableCompanion.insert(id: id, name: name));
+  }
+
+  Future<void> deleteUser(String id) async {
+    await (delete(userTable)..where((u) => u.id.equals(id))).go();
+  }
+
+  Future<void> updateUsername(String id, String newName) async {
+    await (update(userTable)..where((u) => u.id.equals(id))).write(
+      UserTableCompanion(name: Value(newName)),
+    );
+  }
+}