Updates a model policy. Users can update own policies; admins can update any. model_aliases can only be set by admins.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Policy updated
Rate limit (requests per minute). NULL means unlimited.
Daily token budget. NULL means unlimited.
Alias map (alias name → real model name). Single-pass resolution.
Owner (user sub). NULL for platform policies.