I've been trying to find a good example on how to do this but I can't seem to find it. I have added a Pointer column to the users collection pointing to a UserProfile table. I know with custom collections it lets me generate a service, but for the Users collection it only has Login, Logout, and SignUp by default and doesn't let you generate a service. How can I generate an update service for the Users collection, after I add columns? I am having difficulty updating the pointer field to point back to the UserProfile id. Please help!