Three dedicated User columns — base URL, optional bearer, model — for a
provider whose endpoint the user chooses. They are separate from the
OpenAI columns on purpose: the OpenAI arm pins api.openai.com, so it must
share no column with a user-supplied host, and a gateway must never
receive the key issued for OpenAI.
The bearer joins the encrypted-column registry and the rotation script;
the three columns join the account-wipe reset set.
