Backend (new apps.follows):
- FollowedTag/FollowedPool/FollowedPost models; per-user follows with
unseen tracking, plus FollowCloud for the cached blacklist cloud.
- Two periodic commands sharing one fetch path: sync_followed_tags and
sync_followed_pools fetch each followed tag/pool's newest posts (one
e621 search per unique follow), store unseen feed rows, refresh covers
and pool metadata; both fall back to anonymous e621 access.
- API: /api/follows/tags|pools (follow, unfollow, mark seen), a merged
feed with per-follow filtering, and /api/follows/cloud/ which rebuilds
the blacklisted-tag cloud in a daemon thread when its 10 min cache is
stale (polling returns building/ready).
- e621 client now supports anonymous reads; trimmed posts carry preview
URLs for covers and feed tiles.
Frontend:
- /followed page: follow forms, cover cards with unseen badges and
Mark seen, merged feed with filter/unseen toggle, and a blacklist
cloud panel that polls while building. Followed nav entry added.
- MediaItem gains e621_match_status (unknown/matched/not_found/deleted)
and e621_checked_at, backfilled for existing matched items.
- Server-side e621 client (apps/library/e621.py) using the user's stored
credentials, throttled to 2 req/s, with typed errors.
- Matching service: MD5 lookup, manual post linking (flags MD5
mismatches), unlink, metadata refresh, deleted-post detection.
- Detail actions POST /api/files/J-x/match/ and /unlink/ (uploader or
staff only).
- Background library scans: MatchTask + /api/matches/ with missing/all
scopes, progress polling, cancel and stale-task reaping; the scan
counts toward the footer's Active Workers. Same pass available as
manage.py match_e621 for cron.
- Library gains not_found/deleted status filters; the detail page adds
an e621 match card (check / link by post ID / unlink) and the metadata
card warns when a post was deleted on e621.