Adversarial review caught a HIGH the fan-out introduced: activating Version as an
IsConcurrencyToken on Playout/Collection makes EF append `WHERE Version=@orig` to
EVERY root UPDATE, so a non-If-Match writer that saves via plain SaveChangesAsync
now throws DbUpdateConcurrencyException → 500 when a replace-all editor bumps the
row between its load and save. Realistic two-tab trigger (edit playout settings while
editing its alt-schedules; edit a collection's name while reordering) — a new crash,
previously silent last-write-wins.
Fix: shared ConcurrencyExtensions.SaveChangesForcingVersion — on a concurrency
failure it adopts the stored token as original+current (client-wins merge scoped to
the token, never reverting the concurrent bump) and retries, i.e. Phase-1 force-write
semantics for a missing If-Match. Applied to the exposed UPDATE writers:
UpdatePlayout, Update{Sequential,Scripted,ExternalJson}Playout, UpdateOnDemandCheckpoint,
UpdateCollection. Non-vacuous test proves the write lands and the bump survives.
Deletes + repo-mediated Add* writers (rarer / join-rows-only) re-scoped onto #269.
Refs #253#269
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Backend mutation-hardening cluster from the 2026-07-11 mutation-safety audit
sweep (adversarial-reviewer #22/#23), the parallel-safe backend-isolated slice.
audit#22 F4 — standardize post-commit enqueues on CancellationToken.None:
20 command handlers under MediaCollections/, ProgramSchedules/, Playouts/,
Channels/ threaded the request cancellationToken into work that runs AFTER
SaveChangesAsync commits (WriteAsync rebuild/refresh enqueues, mediator.Publish,
reindex, cache Refresh, and post-commit lookups that gate an enqueue). A late
client-disconnect then turns an already-durable commit into a thrown request AND
drops the side effect. Generalizes the #251 deco-handler fix. Excludes
BuildPlayoutHandler (worker/background token, not a client-disconnect token),
the config/FFmpeg multi-upsert handlers (partial-commit case, separate
follow-up), and response-projection reloads (correctly keep the request token).
audit#22 F2 — DeleteChannelHandler/DeletePlayoutHandler now delete the channel
guide {number}.xml through IFileSystem.File.Delete (observable under
MockFileSystem) and BEFORE the commit (a post-commit delete orphans the xml on a
crash; the xml is regenerable on demand, so pre-commit delete is the safe order).
audit#23 F4 — ReplacePlayoutAlternateScheduleItemsHandler rejects an empty item
list in the handler (not only the controller pre-guard) so a direct caller can't
trip the Max()-on-empty crash.
Docs: api-conventions.md §7a (post-commit token convention + boundaries),
decisions.md entry (rationale, sweep scope, #253 PR2-4 coordination note).
Tests: guide-cache-delete-through-FS for both delete handlers, empty-list guard.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* initial work on maintaining playout state
* debugging wip
* fix refresh playout logic
* fix failing test
* more fixes
* update changelog
* comment out some debug logs
* comment out more logs
* starting database redesign
* set season and episode numbers
* use datetimes in db (utc); update movie metadata
* get movie cards from new table
* copy show/episode metadata
* remove old movie metadata type
* rename new movie metadata type
* code cleanup
* start to remove old television classes
* remove old television tables from database
* fix playout building
* fix collection views
* fix show/season views
* clean up movie metadata table
* fix scanner tests
* add libraries ui
* code cleanup
* fix movie scanning/metadata
* add library scan button to ui
* delete library path from ui
* temp disable movie scanning
* remove orphan media items and prevent duplicate paths
* attach artwork to metadata
* fix split show/season display
* fix television artwork
* store year distinct from release date
* fix collections ui
* code cleanup
* add library paths from ui
* fix adding to collections from ui
* fix schedule items loading
* schedule editing works again
* remove some todos
* more cleanup
* fix unit tests
* fix episode sorting
* fix deleting show library paths
* remove unused class
* fix playout list in ui
* fix log viewer
* start to use version/file instead of statistics
* clean up old columns
* fix playout display (time zone)
* fix playback
* fix channel guide time zone
* cascade more deletes
* fix compiler warnings
* fix adding new seasons
* use artwork for channel logo
* clean cache folder on startup (move channel logos, delete everything else)
* log database migration
* update homepage docs for libraries
* fix adding new channel with logo
* fix episode numbers in epg
timothyandClaude Opus 4.8