Operator reframed backfill as inherent to the existing walk: you can't fill
links the system never had by re-downloading media that's already on disk, so
the body/link recapture has to ride the walk itself.
Hoist the post-record capture out of the media-less branch so it runs for EVERY
post — gated once per post by the synthetic post key in the seen-ledger
(detail-fetch for an empty feed body happens at most once; recovery re-captures
unconditionally). A normal BACKFILL now walks history and recaptures each post's
body + external links (which phase 3 imports via upsert_post_record →
_sync_external_links → the download sweep, all already wired). A tick captures
new posts going forward. No separate button — the backfill is the backfill.
Tests: media posts now also carry a synthetic post-key ledger row (count
assertions +1); new test proves an already-on-disk media post still recaptures
its body/links on a re-walk.
Completes the core of #830 (Phase 5). Phase 2 (inline-image localization)
remains.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
5e1655384f