Whether the user has cloud sync/backup enabled on this device.
Human-readable last failure; null when the engine is healthy.
ISO timestamp of the last completed sync; null when never synced.
Rows skipped as too large to back up (surfaced, never silent).
OptionalsurfaceThe closed nine-state sync-surface projection (W6). Optional/additive: the five fields above keep working for existing consumers unchanged.
True while a sync cycle (push or pull) is in flight.
Read-only mirror of the host's cloud entity-sync engine (§27): the backup of this device's entities to the tenant mirror plus the pull of cloud-authored ones. Presentational and id-free — no seqs, cursors, or row identities.