{"checks":[{"age_s":14,"detail":"cohort event log","name":"cohort_feed","ok":true},{"age_s":0,"detail":"1368 mids in 0.33s","name":"exchange_api","ok":true},{"age_s":23512,"detail":"2026-10-04 population, 6.5h old","name":"membership_seed","ok":true},{"age_s":23515,"detail":"2026-10-04 complete, 92.9% coverage","name":"archive","ok":true}],"note":"Ages are measured from the newest fact in each feed, never from an upstream's own status field.","ok":true,"served_at":1791197238.94984,"source":"live","worst_age_s":23515}