I will update the Canvas document to include the missing Row Level Security (RLS) policies for the admin_users table.

This update ensures that:

1. Authenticated Admins can view the list of all administrators.

2. Individual Admins can view their own profile.

3. System-level access (via your triggers) remains functional while preventing unauthorized public access.

I have added the Admins can view all admin users policy to the RLS section. This allows anyone already identified as an admin to query the admin_users table, which is necessary for the is_admin() check to function correctly for existing users.