Implemented basic structure

lib/data/db/database.dart

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+import 'package:drift/drift.dart';
+import 'package:drift_flutter/drift_flutter.dart';
+import 'package:game_tracker/data/dao/group_dao.dart';
+import 'package:game_tracker/data/dao/player_dao.dart';
+import 'package:game_tracker/data/dao/player_group_dao.dart';
+import 'package:game_tracker/data/db/tables/group_table.dart';
+import 'package:game_tracker/data/db/tables/player_group_table.dart';
+import 'package:game_tracker/data/db/tables/player_table.dart';
+import 'package:path_provider/path_provider.dart';
+
+part 'database.g.dart';
+
+@DriftDatabase(
+  tables: [PlayerTable, GroupTable, PlayerGroupTable],
+  daos: [GroupDao, PlayerDao, PlayerGroupDao],
+)
+class AppDatabase extends _$AppDatabase {
+  AppDatabase([QueryExecutor? executor]) : super(executor ?? _openConnection());
+
+  @override
+  int get schemaVersion => 1;
+
+  static QueryExecutor _openConnection() {
+    return driftDatabase(
+      name: 'gametracker_db',
+      native: const DriftNativeOptions(
+        databaseDirectory: getApplicationSupportDirectory,
+      ),
+    );
+  }
+}

lib/data/db/tables/group_table.dart

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+import 'package:drift/drift.dart';
+
+class GroupTable extends Table {
+  TextColumn get id => text()();
+  TextColumn get name => text()();
+
+  @override
+  Set<Column<Object>> get primaryKey => {id};
+}

lib/data/db/tables/player_group_table.dart

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+import 'package:drift/drift.dart';
+import 'package:game_tracker/data/methods/db/tables/group_table.dart';
+import 'package:game_tracker/data/methods/db/tables/user_table.dart';
+
+class PlayerGroupTable extends Table {
+  TextColumn get userId => text().references(UserTable, #id)();
+  TextColumn get groupId => text().references(GroupTable, #id)();
+
+  @override
+  Set<Column<Object>> get primaryKey => {userId, groupId};
+}

lib/data/db/tables/player_table.dart

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+import 'package:drift/drift.dart';
+
+class PlayerTable extends Table {
+  TextColumn get id => text()();
+  TextColumn get name => text()();
+
+  @override
+  Set<Column<Object>> get primaryKey => {id};
+}