Queued tracker writes carried no account identity, so rows created under account A replayed against account B after a reconnect; explicit disconnect now purges that service's queue. An in-flight markWatched/reconcile that failed after the purge was re-enqueued anyway (the write scope only tracked profile generation) and replayed into whichever account connected next: Tracker.accountBinding (client identity, rebound synchronously on every disconnect) is captured before each write and re-checked before queueing a retry, and because the check sits in the same synchronous segment as the enqueue, a row that passes it is claimed ahead of the purge in the queue mutex and is still removed by it.
The memoized anime-list snapshot survived writes, so sequential rewatch updates computed from pre-write state; successful writes now evict the entry.
A device-code dialog dismissed by system back never cancelled the poll (blocking new attempts until the deadline), and a user-cancelled sign-in showed the connection-failed snackbar; both now route through one cancel path.
Trakt was the one service outside the tracker abstraction. TraktScrobbleService
re-implemented the whole playback lifecycle beside TrackerCoordinator, and
TraktSyncService pushed watched state from its own WatchStateNotifier
subscription, so the player called two objects at every lifecycle point and one
watch could be written twice. TraktTracker now implements RealtimeScrobbleTracker
like Simkl; the duplicated player call sites collapse to one each, and Trakt
shares the coordinator's ID resolver instead of re-fetching show ids every
episode.
Capabilities are split so a tracker declares what it is rather than being
special-cased: ScrobblePolicy carries each service's own resend/seek rules,
EpisodeHistoryTracker names the remote row a per-item history write targets, and
SeriesProgressTracker covers one-counter-per-series services. Writes from all
four trackers go through a shared TrackerWriteQueue, generalised from the
Trakt-only queue, with the legacy Trakt payload migrated on load. Trakt becomes
the fourth TrackersProvider slot and TraktAccountProvider is deleted, so one
object owns the active session per profile.
Two failure paths found while consolidating are fixed here too.
The queue's retries only ran on profile bind, connect and app foreground, so a
network blip mid-session left queued watches waiting for the next foreground.
OfflineModeProvider now notifies on connectivity changes, not just offline-state
or WiFi-flag changes, and main.dart flushes the queue when the network returns.
The queue also counted every failure toward the five attempts that permanently
drop an item, so a rate limit or a service having a bad hour could discard a
pending watch - the loss the queue exists to prevent. Only an answer about the
write itself now spends an attempt: 4xx counts, while rate limits, 5xx,
recoverable token-refresh failures and requests that never arrived do not. A
back-off answer also defers that service for the rest of the flush, so a queue
holding many rows does not fire all of them at a service that just asked for
quiet.
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