let's say you have a subject

user

. You want to provide a UX for admin `user`s to create custom roles and assign them to other `user`s. This would be some API that the admin user calls which eventually calls the Authzed service to update the schema. Is this common or am I missing something? Looks like the

SchemaService.WriteSchema

overwrites the existing schema. There's no way to incrementally add new portions of the schema, is there?