Authorization schema for a demo real-time messaging app

schema.perm

entity user {}

entity roles {
 relation admin @user
}

entity message {
    relation owner @user
  // permissions
    permission create  = owner
  
}

entity chatroom {

    relation parent @roles
    // represents owner of this repository
    relation owner  @user

    // permissions
    permission delete = parent.admin or owner 
}