save_watchlist_scan_run had a single caller — the manual scan endpoint. the automatic/
scheduled path (process_watchlist_scan_automatically) ran the full scan but never wrote a
history row, so nightly scans never showed up in the History modal — only manual ones.
- new shared helper persist_scan_run(database, state, ...) extracts the run from the
finished watchlist_scan_state and writes one history row
- the automatic path now stamps scan_run_id/scan_track_events and calls it
- the manual path is refactored onto the same helper so the two can't drift apart again
- history is global (no profile filter), so the all-profiles nightly scan records one
aggregate row (profile_id None → 1, never NULL)
tests: 4 new persist_scan_run seam tests (real DB) + 2 new auto-scan integration tests
proving the auto path actually records (completed + cancelled, exactly once). 420
watchlist/automation tests green.
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