Complete the SHA-256 lifecycle for preexisting databases: items
imported before hashing existed get hashed automatically, and any
content duplicates discovered in the process land on the new admin
Hash Conflicts page for an explicit keep/merge decision.
HashBackfillService (runs once 30s after startup, independent of
auto-scan):
- hashes every media_items row where file_sha256 IS NULL, resolving
each path through LibraryService; per-item failures are logged and
skipped so one unreadable file cannot block the pass
- no-op once everything is hashed (logged and skipped)
- finishes with a conflict sweep flagging every content-duplicate
group via FindHashConflictGroups + CreateHashConflict; the sweep
runs after the per-item pass because a preexisting pair only
becomes detectable once both sides have their hash
API (admin-only):
- GET /api/admin/hash-conflicts - pending groups with member items
and usage counts
- POST /api/admin/hash-conflicts/:id/resolve - action=keep_all, or
action=keep with keep_uuid: validates the uuid belongs to the
group, re-parents every other copy's child rows onto the kept item
(reparent_media_item_children), deletes the losers, and records
the resolution + resolving admin; accepts form or JSON bodies and
returns the htmx resolved fragment
Page route /admin/hash-conflicts (admin-only) renders the template
with hydrated conflict data; HashConflictsHandler wired into the
router Config and constructed in main.
Verified end-to-end against the live database: duplicate detection,
pending listing, keep_all resolution, merge path (re-parent +
delete), and - critically - a resolved group is not re-flagged by a
later sweep (upsert no-op). Database restored afterward.
