{
 "active_domains": [
  "a",
  "b",
  "c",
  "h"
 ],
 "computed_after_the_fact_by": {
  "commit": "c1933d30cca6c52bcaddece24f53b37381273434",
  "tool": "tools/orderbook_mirror/backfill_witness_stats.py"
 },
 "hour": "2026-08-27T01",
 "latency_note": "latency_ms = timestamp_received - timestamp (collector receipt minus venue clock), per domain, over ALL input rows including domains that lost the merge. Unrecoverable once the hour's staging is pruned.",
 "products": {
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