Refacor electron app and add migrations

electron/cqrs/commands/handlers/clearRoomMessages.ts

@@ -0,0 +1,9 @@
+import { DataSource } from 'typeorm';
+import { MessageEntity } from '../../../entities';
+import { ClearRoomMessagesCommand } from '../../types';
+
+export async function handleClearRoomMessages(command: ClearRoomMessagesCommand, dataSource: DataSource): Promise<void> {
+  const repo = dataSource.getRepository(MessageEntity);
+
+  await repo.delete({ roomId: command.payload.roomId });
+}