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AlexRV12andClaude Opus 5 35bde36730 feat: run a workspace handler when a secret variable expires

Secret variables gain an optional `value_expires_at`, and a workspace can point
at a script or flow to run once that date passes, so a rotation is driven by the
platform instead of tracked out of band.

The secret never leaves the database. The sweep selects the path, description and
expiry and nothing else, so the handler is given a reference to rotate rather than
a value to handle. Job results are stored in cleartext and shown in Runs, which is
what makes that a boundary rather than a preference; a test asserts the job's args
never contain the value.

Each row is claimed by writing `expiration_dispatched_for` in the same transaction
as the push, so a failed push un-claims it and a lost race claims nothing. Moving
the date re-arms the row; re-saving the same date does not. A pass takes at most
100 rows under a transaction-scoped advisory lock, and orders so that one broken
workspace cannot starve the rest.

Dispatch runs as `g/variable_expiration_handler`, exempt from the CE group limit
and from non-premium exec metering the way the error and schedule handlers already
are. A handler that keeps failing backs off and raises a critical alert instead of
retrying every pass, and the back-off ends when the handler is repointed.

The expiry travels with the variable through workspace clone, tarball export and
workspace comparison. The dispatch marker deliberately does not, so a fork re-arms
on its own copy.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-27 12:15:23 +02:00