Milestone #73 (reconcile duplicate gallery-dl/native post rows) shipped in
eff6427; closing it out after today's #87 work, which added a seam it didn't
account for. _repoint_post_links drops a loser post's ImageProvenance row on the
(image, post) uniqueness collision — and that row may now carry from_attachment_id
(which archive the file was extracted from). For the exact gallery-dl->native
case this targets, the keeper is the native stub (no archive) and the loser is the
gallery-dl row that extracted the member, so a blind delete silently lost the
containing-archive linkage. Carry from_attachment_id onto the keeper's surviving
row (when NULL) before dropping the collision.
The rarer PostAttachment-collision case (both dup posts captured the same archive
blob) doesn't arise in the targeted scenario — the archive lives only on the
gallery-dl post, so it re-points straight to the keeper and the FK stays valid.
Test: collision merge preserves the loser's from_attachment_id on the keeper.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
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