WIP auth, added Drift for database and refined shared_models for data exchange

backend/lib/database.dart

@@ -0,0 +1,53 @@
+import 'dart:io';
+
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+
+part 'database.g.dart';
+
+class Users extends Table {
+  TextColumn get uuid => text().unique()();
+  TextColumn get gameRoom => text().references(GameRooms, #uuid).nullable()();
+  TextColumn get name => text().withLength(min: 2, max: 32)();
+  DateTimeColumn get createdAt => dateTime().nullable()();
+}
+
+enum GameStatus {
+  opened,
+  running,
+  closed,
+}
+
+class GameRooms extends Table {
+  TextColumn get uuid => text().unique()();
+  TextColumn get status => textEnum<GameStatus>()();
+  DateTimeColumn get createdAt => dateTime().nullable()();
+}
+
+@DriftDatabase(tables: [Users, GameRooms])
+class AppDatabase extends _$AppDatabase {
+  AppDatabase() : super(_openConnection());
+
+  @override
+  int get schemaVersion => 1;
+
+  static QueryExecutor _openConnection() {
+    return NativeDatabase.createInBackground(File('./backend.db'));
+  }
+
+  @override
+  MigrationStrategy get migration {
+    return MigrationStrategy(
+      beforeOpen: (details) async {
+        // Statements to run to make sqlite performant, running in WAL mode, etc
+        await customStatement('PRAGMA foreign_keys = ON');
+        await customStatement('PRAGMA journal_mode=WAL');
+        await customStatement('PRAGMA busy_timeout=5000');
+        await customStatement('PRAGMA synchronous=NORMAL');
+        await customStatement('PRAGMA cache_size=10000');
+        await customStatement('PRAGMA temp_store=MEMORY');
+        await customStatement('PRAGMA mmap_size=268435456');
+      },
+    );
+  }
+}