authOpenIDMatchExistingBy is unset on this deployment, so ABS matches an
OpenID userinfo on sub only and auto-registers everyone else. A new authentik
username that equals an existing ABS username therefore dies on the unique
constraint inside the callback, reported only as 'Unauthorized' - which is
exactly what a future agent would hit by 'just creating a frank user' in the
IdP to reach the root account. Records the two real doors (match by username,
which links and keeps root, since setUserGroup refuses to downgrade a root;
or a non-colliding name), and corrects the admin-membership row: akadmin is
the operator's own authentik account, already granted site admin.
Frank
7e72126a07