timothyandClaude Opus 4.8
dfed9a393b
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An on-demand channel (`PlayoutMode.OnDemand`) already is the "resume where I left off" feature: `Playout.OnDemandCheckpoint` persists the viewer's position and `PlayoutTimeShifter.TimeShift` slides the materialized timeline forward on tune-in so the paused item is active again. Because it rewrites `GuideStart`/ `GuideFinish` alongside `Start`/`Finish`, guide and playback freeze together — structurally avoiding the free-running-wall-clock desync #68 was filed about. The one gap: `TimeShift` rewrote the stored `PlayoutItem` rows but the XMLTV guide is served from a cached fragment that only `RefreshChannelData` rebuilds, and the tune-in path never enqueued it. So an external EPG client polling after a thaw could see a stale timeline until the next incidental rebuild. Fix: `IPlayoutTimeShifter.TimeShift` now returns the channel numbers whose cached guide is stale — the shifted channel plus any channels that mirror it (the same fan-out `BuildPlayoutHandler` already does) — and `TimeShiftOnDemandPlayoutHandler` enqueues a `RefreshChannelData` for each on `CancellationToken.None` (post-commit side effect must not be abandoned if the session token cancels). Tests: handler enqueues a rebuild per stale channel (+ mirror + no-shift cases); `PlayoutTimeShifter` reports source+mirrors on a shift, empty on Continuous / zero-offset / active-unforced, and correctly seeds+shifts a never-watched playout. Non-vacuity of the enqueue proven by a compiling negative control. Docs: channels.md (On-demand resume section), domain-model.md, decisions.md (scheduling.ondemand-guide-refresh-on-thaw). Per-viewer resume is out of scope (single per-channel checkpoint; #68 says per-channel suffices). fixes #68 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>