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Stop trusting Plex's Date Added on its own

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Jess spotted that dates looked like file dates rather than library-add dates.
He is right, and MediaShelf was not the culprit: it reproduces Plex's addedAt
exactly (verified 500/500 identical to the second). Plex's own field is what
follows the file — replace or re-encode one and Date Added resets while the
item, its ratingKey and its watch history all survive.

Measured on the live library, comparing addedAt against lastViewedAt where both
exist: 55 of 509 movies (10.8%) and 306 of 1,393 TV Show Archive items (22.0%)
were watched BEFORE they were "added" — 19% overall. 2001: A Space Odyssey
reports added 2026-07-31, last watched 2017-08-26.

That is not cosmetic. pre_history is derived from added_at, so an old item whose
file was replaced looks post-coverage and gets promoted into the CONFIDENT
reclaim pool, which is the one pool meant to be trustworthy.

A completed play proves the item already existed, so added_at is now
MIN(provider_added_at, first_watched_at). Plex's raw value is kept in
provider_added_at, added_at_source records which applied, and the item drawer
explains the substitution instead of quietly disagreeing with Plex. Unwatched
items keep Plex's value since nothing contradicts it. first_seen_at is also
recorded now and is authoritative for anything added from here on.

Plex's API has no better field; the true insert time is only in Plex's own
metadata_items.created_at on Loki.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GVbG48GAXfCZatcmX123Ra
This commit is contained in:
Jess Hallsworth 2026-09-10 17:35:48 +00:00
parent d12cbc62ee
commit e819548ff2
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9 changed files with 234 additions and 15 deletions
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mediashelf/static/app.css
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@ -156,6 +156,7 @@ td.title-cell { max-width: 380px; overflow: hidden; text-overflow: ellipsis; }
.flag.duplicate { color: var(--accent); border-color: var(--accent); }
.flag.kept { color: var(--kept); border-color: var(--kept); }
.flag.multi_part, .flag.history_gap { color: var(--faint); border-color: var(--faint); }
.flag.added_corrected { color: var(--accent); border-color: var(--accent); opacity: .8; }
.pager { display: flex; gap: .6rem; align-items: center; justify-content: center; padding: .7rem; color: var(--dim); font-size: .85rem; }