builtbykev
1728ce4fac
Found by cross-checking the observer against an independent SQL derivation of the same natural cohort instead of accepting its own answer. The 2026-08-31 03:00Z run held 1,970 rows across TWO game_dates — 1,572 on 08-31 and 398 on 08-30, the late slot spanning midnight ET. The observer selected the head row's date and filtered to it, so it measured 646 of the 801 eligible keys and reported HEALTHY. Both slices happened to be fully covered, so the verdict was right by luck; a date slice with zero lineage would have been invisible behind it. The audit now covers the whole snapshot_id and reports every game_date it spans. A test builds the real two-date shape with one slice uncovered and requires PARTIAL_COVERAGE. Suite 397/5,499/0 · 15/15 teeth. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CQJeAG8vcDoL5zkiaJyVb8