Records the caller's own uninstall. Body-less by construction (identity is the certificate). <br><b>Always 200 on a verified identity</b>, carrying the outcome in the body rather than in the status code. The device is mid-uninstall and is about to delete its own credentials: there is nothing it can usefully do with a 404, and treating "no row" as an error would make the scanner's best-effort call log a failure on a path that in fact reached the right end state. A caller whose certificate does not verify never gets here — the A1 boundary answers 403 first.