{"database": "audit", "table": "anomaly_baseline_volume", "rows": [["bc:customers:backfill", 0, 19, 2.5833333333333335, 1.5050420310248867, 12, "2026-05-21 06:58:58"]], "columns": ["source", "day_of_week", "hour", "mean_per_hour", "stddev", "sample_size", "learned_at"], "primary_keys": ["source", "day_of_week", "hour"], "primary_key_values": ["bc:customers:backfill", "0", "19"], "units": {}, "query_ms": 1.5862048603594303}