Refacor electron app and add migrations

electron/cqrs/commands/handlers/deleteMessage.ts

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