- Before the first user-data read finishes, an edit is compared with the
cache, so it sends only its own playlist entry.
- Queued entries carry their edit number; a failed write is retried only
when nothing newer replaced it.
- Moving M3U favorites and history translates channel ids through the
stream URL (ids are random per import).
- The server-storage E2E runs in Chromium only: one shared database.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
