Removing due to circular dependency

backend/src/album/album.entity.ts

@@ -1,6 +1,5 @@
 import { Entity, Column, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
 import { IsNotEmpty, IsString } from 'class-validator';
-import { AlbumTitleUnique } from './middleware/uniqueAlbumTitle.middleware';
 import { Song } from '../song/song.entity';
 
 @Entity()
@@ -11,7 +10,6 @@ export class Album {
   @Column()
   @IsString()
   @IsNotEmpty()
-  @AlbumTitleUnique()
   title: string
 
   @Column()

backend/src/album/middleware/uniqueAlbumTitle.middleware.ts

@@ -1,32 +0,0 @@
-import { registerDecorator, ValidationOptions, ValidatorConstraint, ValidatorConstraintInterface } from 'class-validator';
-import { Injectable } from '@nestjs/common';
-import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
-
-@ValidatorConstraint({ async: true })
-export class UniqueAlbumTitle implements ValidatorConstraintInterface {
-  constructor(@InjectRepository(Album)
-  private albumRepository: Repository<Album>
-) {}
-
-  validate(albumTitle: string) {
-    return this.albumRepository.findOneBy({
-      where: {
-        id: title
-      }).then((albumTitle) => {
-      return albumTitle === undefined;
-    });
-  }
-}
-
-export function AlbumTitleUnique(validationOptions?: ValidationOptions) {
-  return function (object: object, propertyName: string) {
-    registerDecorator({
-      target: object.constructor,
-      propertyName: propertyName,
-      options: validationOptions,
-      constraints: [],
-      validator: AlbumTitleUnique,
-    });
-  };
-}

backend/src/song/song.entity.ts

@@ -1,6 +1,6 @@
 import { Entity, Column, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
 import { IsNotEmpty, IsNumber, IsString } from 'class-validator';
-import { Album } from '../album/album.entity';
+import { Album } from '@/album/album.entity';
 
 @Entity()
 export class Song {