App\Entity\User:
    type: entity
    repositoryClass: App\Entity\Repository\UserRepository
    table: user
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        username:
            type: string
            length: 32
            unique: true
        password: # the hashed password
            type: string
        apiToken:
            type: string
            unique: true
            nullable: true
        roles:
            type: json
    oneToMany:
        heroes:
            targetEntity: Hero
            mappedBy: user
            cascade: ["persist", "merge"]