{
 "active_domains": [
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  "b",
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  "h"
 ],
 "computed_after_the_fact_by": {
  "commit": "a2a188a9e75aa9d7170748d0b784c38f54422e7d",
  "tool": "tools/orderbook_mirror/backfill_witness_stats.py"
 },
 "hour": "2026-08-26T13",
 "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.",
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