Prevent username reusing

src/models/entities/used-username.ts

@@ -0,0 +1,20 @@
+import { PrimaryColumn, Entity, Column } from 'typeorm';
+
+@Entity()
+export class UsedUsername {
+	@PrimaryColumn('varchar', {
+		length: 128,
+	})
+	public username: string;
+
+	@Column('timestamp with time zone')
+	public createdAt: Date;
+
+	constructor(data: Partial<UsedUsername>) {
+		if (data == null) return;
+
+		for (const [k, v] of Object.entries(data)) {
+			(this as any)[k] = v;
+		}
+	}
+}

src/models/index.ts

@@ -43,6 +43,7 @@ import { HashtagRepository } from './repositories/hashtag';
 import { PageRepository } from './repositories/page';
 import { PageLikeRepository } from './repositories/page-like';
 import { ModerationLogRepository } from './repositories/moderation-logs';
+import { UsedUsername } from './entities/used-username';
 
 export const Apps = getCustomRepository(AppRepository);
 export const Notes = getCustomRepository(NoteRepository);
@@ -64,6 +65,7 @@ export const UserGroups = getCustomRepository(UserGroupRepository);
 export const UserGroupJoinings = getRepository(UserGroupJoining);
 export const UserGroupInvites = getCustomRepository(UserGroupInviteRepository);
 export const UserNotePinings = getRepository(UserNotePining);
+export const UsedUsernames = getRepository(UsedUsername);
 export const Followings = getCustomRepository(FollowingRepository);
 export const FollowRequests = getCustomRepository(FollowRequestRepository);
 export const Instances = getRepository(Instance);