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- Every playlist mutation is sent on the version it was read at: the payload's ETag, else the playlist's last read (portal documents have no payload). Refused versions are tracked per playlist, so a conflict on one never disables the check on another at the same revision. Imports and start-up migrations (dbUpsertAppPlaylists) stay unconditional. - A closed tab's adopted edits replay before this tab's queued ones, from the base of its first step, so newer progress is not replaced by older. - A reload or adoption removes the old page load's saved writes only when this page saved its copy; each closed tab is adopted once per page. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>