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Use Plex's lastViewedAt for the date correction, not just Tautulli

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The correction shipped in the previous commit fired zero times on the live
library. It compared Plex's addedAt against MediaShelf's first completed
Tautulli play, but Tautulli history only starts 2025-03-08 and the wrong dates
are overwhelmingly older than that. The evidence that proved the bug in the
first place was Plex's own lastViewedAt - which the provider parsed and then
dropped on the floor.

Now stored as provider_last_viewed_at and folded into the bound:
added_at = MIN(provider_added_at, first_watched_at, provider_last_viewed_at).
Seasons also get their own provider_added_at (MIN over episodes), without which
their added_at_source could never be computed.

Fixture gains the case that actually failed: added last week, last viewed 1500
days ago, no Tautulli history at all - so only lastViewedAt carries it. Also
tightened test_correction_leaves_unwatched_items_alone, which defined
"unwatched" as watch_count=0 and so wrongly expected an item with Plex view
evidence to be left alone.

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 17:49:20 +00:00
parent e819548ff2
commit edbb6f088f
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6 changed files with 134 additions and 36 deletions
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mediashelf/migrations/003_provider_last_viewed.sql Normal file
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-- The added_at correction added in 002 could only use Tautulli's history, which
-- starts 2025-03-08. But the evidence that proved Plex's addedAt wrong is Plex's
-- own lastViewedAt, which reaches back years further — 2001: A Space Odyssey
-- reports added 2026-07-31 and last watched 2017-08-26.
--
-- That field was parsed by the provider and then dropped on the floor, so the
-- correction fired zero times on the live library. Store it.
--
-- Seasons also need a provider_added_at of their own (the MIN over their
-- episodes), or their added_at_source can never be computed.
ALTER TABLE media_item ADD COLUMN provider_last_viewed_at INTEGER;
ALTER TABLE episode ADD COLUMN provider_last_viewed_at INTEGER;