TypeORM @manytomany, establish a two-sided `CASCADE` structure for the ManyToMany relationship.

request-user.entity.ts

// You can set up the structure without creating this entity, but when the project grows, 
// you will need the entity for leftJoin.
import { BaseEntity, Entity, PrimaryColumn } from 'typeorm';

@Entity()
export class RequestUser extends BaseEntity {
    @PrimaryColumn('uuid')
    requestId: string;

    @PrimaryColumn('uuid')
    userId: string;
}

request.entity.ts

@ManyToMany(() => User, user => user.requests, { onDelete: 'CASCADE' })
@JoinTable({ name: 'request_user' })
@Field(() => [User], { nullable: true })
users: Promise<User[]>;

user.entity.ts

@ManyToMany(() => Request, request => request.users, { onDelete: 'CASCADE' })
@Field(() => [Request], { nullable: true })
requests: Promise<Request[]>;