The 10 s tick in flight when the player finishes (or a refusal rollback whose state write in fact
committed) wrote its mid-item position onto the freshly watched row and scheduled a resume push
after the scrobble, so Plex showed the item in progress again. The checkpoint is now a conditional
write that skips a row marked watched in the last 30 s and answers like a finish; a rewatch past
that is checkpointed as before. Marking an item (or a season/show) watched also supersedes resume
pushes still in flight, as the near-end finish already did.
The last Plex HTTP files do no database work of their own, so ALLOWED is empty: no route builds
SQL, touches the session or a unit's table. Discover's rails move whole into plex/discover.py; a
user's playlists, watch-state writes (the race-safe finish, an early checkpoint, a status, a
season or show at once) and the watch-sync link go through plex/queries.py and plex/service.py.
The plex package joins FENCED: it reads no other unit's tables, says whose a row is through
userscope (the rollup and the watch sync's 8 inline filters moved to owned_by), and commits only in
its named jobs — the library sync, TMDB enrichment, the watch sync and its background pushes.
A playlist's has-item probe keeps the plain key lookup, so a NUL in it is still the 422 a test pins.
Pins 178 -> 0; basedpyright baseline 118 -> 106.
PlexLibrary, PlexShow, PlexSeason, PlexItem, PlexPerson, PlexCollection, PlexState, PlexLink,
PlexPlaylist and PlexPlaylistItem leave app/models.py for app/plex/models.py; app.tables registers
them. Every import is re-pointed; no schema change.
Two rows of the canonical-patterns table had drifted, found while closing the roadmap audit:
- 63 mutation responses carried no `ok` — `{"unsubscribed": true}`, `{"status": "ok"}`,
`{"added": 3, …}` and so on. Each now leads with `"ok": true` (additive: every field a client
reads is still there).
- Twelve route helpers committed on their own. Six were just the end of their handler's work and now
flush: the playlist item add/remove and Watch later get-or-create, the Plex series/season bulk
mark, and the invite decision + account activation — which an approval used to land in separate
transactions. The other six commit on purpose (a token durable before its link is mailed, a
single-use token burned as its own unit, the Google callback's tail, a background registration
with its own session, the staged search ingest around YouTube calls), each listed with its reason.
`tests/test_route_conventions.py` holds both rules in code; CLAUDE.md's two rows point at it.
HLS sessions were keyed by the item, so a second account opening the same
film killed the first one's session; the displaced player reclaimed at its
playhead and evicted the other in turn. The registry is now keyed by
(viewer, rating_key), segment requests resolve by both, and the session
directory carries the viewer (the orphan sweep still recognises the older
shapes).
Only transcodes counted toward a cap, so remuxes — each a whole segmented
copy of the film on the scratch volume — were bounded by the library size.
Three bounds now apply after every start, each dropping the least recently
used: two sessions per account, the transcode cap, and a new admin knob,
plex_max_sessions (default 8), over every session. A superseded session
request returns at once, since it waits on the killed ffmpeg, so an account
cannot park more request workers than it may hold sessions.
The subtitle extractor's full-pass slots were global and minutes long each;
one account opening subtitles on film after film could hold them all. An
account may now hold three of the six, and still gets windows past that.
Two near-end checkpoints arrive together routinely (the 10 s tick and the
debounced seeked flush); both read "not watched" before writing and both
scrobbled, bumping Plex's viewCount twice. The transition is now decided by
the write: an insert that did not conflict, or an update conditional on the
old status.
The finish also popped the push-ordering entry that _resume_push_superseded
reads, so an older resume push still in flight could land at Plex after the
scrobble and revive a resume point on a watched item. It now stamps the
entry instead; the existing eviction bounds the map.
peter