v0.8.0

Added

Contracts\CommitObserver — the engine tells a listener that a space advanced, so devices no longer have to ask to find out. Polling alone makes the interval a straight trade between how stale the data may be and how much load every idle device puts on the server.

It carries the watermark and nothing else, on purpose. The log is per space, but authorization is per principal and per view: putting the changes in the signal would hand every listener everything written in that space, including the rows and fields a given reader may not see. The signal says there is something new, up to here; the reader then asks through the endpoint that knows who it is.

Called after the transaction commits, never inside it — a rollback must not announce a write that did not happen, and a replay or a refusal appends no commit so it signals nothing. A throw cannot unmake a commit that already happened, so the engine does not let one reach the caller either: failing a push for a durably stored mutation would only make the client retry, meet its own receipt, and be told the same thing again.

Delivery is at-most-once and unordered by contract, which is why a reader still polls on a slow timer. The signal makes sync prompt; the cursor is what makes it correct.

cboxdk/laravel-sync turns it into a SpaceAdvanced event, with webhook delivery over cboxdk/laravel-ssrf and cboxdk/laravel-webhook-signature.