Refacor electron app and add migrations

electron/data-source.ts

@@ -0,0 +1,43 @@
+/**
+ * TypeORM DataSource used by the CLI migration tools (generate / run / revert).
+ *
+ * At **runtime** the DataSource is constructed inside `main.ts` and
+ * pointed at the user's Electron `userData` directory instead.
+ *
+ * For CLI use, the database is stored at the project root (`metoyou.sqlite`)
+ * so TypeORM can diff entity metadata against the current schema when
+ * generating new migrations.
+ */
+import 'reflect-metadata';
+import { DataSource } from 'typeorm';
+import * as path from 'path';
+import * as fs from 'fs';
+import { settings } from './settings';
+import {
+  MessageEntity,
+  UserEntity,
+  RoomEntity,
+  ReactionEntity,
+  BanEntity,
+  AttachmentEntity,
+  MetaEntity
+} from './entities';
+
+const projectRootDatabaseFilePath = path.join(__dirname, '..', '..', settings.databaseName);
+
+let databaseFileBuffer: Uint8Array | undefined;
+
+if (fs.existsSync(projectRootDatabaseFilePath)) {
+  databaseFileBuffer = fs.readFileSync(projectRootDatabaseFilePath);
+}
+
+export const AppDataSource = new DataSource({
+  type: 'sqljs',
+  database: databaseFileBuffer,
+  entities: [MessageEntity, UserEntity, RoomEntity, ReactionEntity, BanEntity, AttachmentEntity, MetaEntity],
+  migrations: [path.join(__dirname, 'migrations', '*.{ts,js}')],
+  synchronize: false,
+  logging: false,
+  autoSave: true,
+  location: projectRootDatabaseFilePath
+});