#239 moved §5.7's attention window to `failed_at` and left §6.2's pack
ladder on `grabbed_at`. A torrent that stalls for weeks before ffprobe
condemns it at import has elapsed the whole ladder the moment it fails,
so the pack lane retried a source that had just failed — the one thing
the backoff exists to prevent.
The ladder now measures from the failure, the same anchor and the same
column §5.7 reads, with `grabbed_at` as the fallback for rows written
before the column existed. All three sites read
`max(coalesce(failed_at, grabbed_at))`, so the `last_failed_at` alias
holds what its name says — including the one the season deck feeds into
`reopens_at` and `pack_retry_at`, which was showing a grab time under a
name §5.7 had redefined.
DESIGN.md §6.2 states the anchor the way §5.7 states its own.
Tests cover a pack grabbed 35 days ago and failed 10 minutes ago on the
targeted lane, the RSS lane and the season deck.
`just ci` through the gate: 519/519 tests pass, web checks clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Miguel Palhas
55373d228c