アカウント削除時にサインイン履歴も削除するように

src/server/api/endpoints/i/delete-account.ts

@@ -4,6 +4,7 @@ import User from '../../../../models/user';
 import define from '../../define';
 import { createDeleteNotesJob, createDeleteDriveFilesJob } from '../../../../queue';
 import Message from '../../../../models/messaging-message';
+import Signin from '../../../../models/signin';
 
 export const meta = {
 	requireCredential: true,
@@ -44,6 +45,7 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	});
 
 	Message.remove({ userId: user._id });
+	Signin.remove({ userId: user._id });
 	createDeleteNotesJob(user);
 	createDeleteDriveFilesJob(user);