Closes#968.
The roles-join fallback in adminAuth fabricated role_name='super_admin' on ANY database error, so a transient fault (connection reset, deadlock, statement timeout, pool exhaustion) silently granted super_admin for its duration. roleName is the sole discriminator for every ownership check, so this inverted the authorization model rather than failing the request.
Gate the fallback on isMissingRolesSchema(), moved to utils/dbErrors.js and shared with apiTokenAuth. The predicate was also tightened: knex prefixes the failing SQL to err.message and that SQL always names `roles`, so the old /roles/i gate was vacuous and a generic /does not exist/ could accept unrelated faults. Now trusts SQLSTATE 42P01/42703 on Postgres and exact driver phrasing on SQLite.
Paul Nothaft