JWT `iat` has 1-second resolution; `password_changed_at` is stored with
sub-second precision. The previous comparison rejected tokens whose iat
fell in the same wall-clock second as a password change — e.g. a token
issued by an immediate re-login after a password reset, or by any
script-driven flow that resets and logs in in quick succession. Floor
the stored timestamp to whole seconds before comparing.
Caught while wiring up the local E2E suite: the seeder needed a
"set password_changed_at 10 s in the past" hack to avoid this race;
with the fix in place that hack is gone and the suite is naturally
deterministic.
Paul Nothaft
793e410554