When get_team_object fails, the centralized auth gate rebuilds the team
from the token's own fields. A token whose team row was missing when the
key was read carries team_models=[] and team_blocked=False, and the
model-access check reads an empty model list as every model, so the
rebuilt team grants more than the real team ever did.
get_team_object reported a deleted team and a database that would not
answer as the same 404, so the fallback could not tell a definitive
answer from a degraded read. Raise a TeamNotFoundError subclass, still a
404 with the same detail so every other caller is unaffected, only when
the database answers and the row is absent.
A team that is provably gone now refuses, and no setting overrides that.
Otherwise the grant is merely unknown: a token carrying one may vouch,
since replaying a recorded grant cannot widen it, and a token carrying
none may not. allow_requests_on_db_unavailable still opts back out there,
and is only consulted once the failure is known to be a degraded read.