{"database": "audit", "table": "source_truth", "rows": [["bc:orders:backfill", 715212, null, null, "2026-05-20 12:28:18", "api_walk", "BigCommerce orders backfill (/v3/orders REST). 2015-01-01 onward, both CV and WS stores. [HISTORY] 2026-05-20: bc_hash=NULL bug fixed; 48,834 legacy duplicate events in audit.db are immutable (chain hash design forbids retroactive UPDATE). DISTINCT_COUNT_SOURCES workaround in refresh_coverage_snapshot.py keeps display count accurate. Forward dedup verified working (gap-close run committed 397 new orders with 705,944 dedup hits).", "bc:orders:backfill", null, null, null, "backfill", null, null]], "columns": ["source", "api_total", "api_oldest", "api_newest", "measured_at", "method", "notes", "event_source", "event_category", "live_event_source", "live_event_category", "mode", "freshness_sla_minutes", "heartbeat_source"], "primary_keys": ["source"], "primary_key_values": ["bc:orders:backfill"], "units": {}, "query_ms": 1.57264806330204}