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          }
        },
        "price_change": {
          "boundary_dropped": 500,
          "class": "PARTIAL",
          "exception_markets": 123946,
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          "rows_by_domain": {
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        },
        "tick_size_change": {
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          "witness_latency": {
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              "min_ms": 2,
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              "p99_ms": 31.0,
              "rows": 2100,
              "unmeasurable": 0
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            "e": {
              "buckets_ms": {
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              "max_ms": 7665,
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              "measurable": 2064,
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            },
            "h": {
              "buckets_ms": {
                "0_1ms": 0,
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                "200_500ms": 4,
                "20_50ms": 108,
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                "neg": 0
              },
              "max_ms": 2766,
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              "measurable": 2100,
              "min_ms": 9,
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              "p99_ms": 114.0,
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          }
        }
      },
      "archive_root": "merged-live",
      "boundary_guard": "cache",
      "generated_by": "tools/orderbook_ab/merge_ab.py",
      "hour_utc": "2026-08-31T12:00:00+00:00",
      "max_sequence": 53198775214702734,
      "merger_git_sha": "unknown: fatal: not a git repository (or any of the parent directories): .git",
      "min_sequence": 281484468874683,
      "row_count": 80401024,
      "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the LAST ACTIVE domain's values -- for this hour, domain e (active: b, c, h, e)",
      "witness_stats": "2026-08-31T12.witness_stats.json",
      "witnesses": "bche"
    }
  },
  "verification": {
    "primary": "sha256sum <file> == .sha256",
    "secondary": "curl -r <start>-<end-1> <url> | sha256sum == .products.<name>.sha256",
    "note": "A range digest certifies BYTES. That those bytes are that product comes from this manifest and is cross-checkable against the Parquet footer, which is inside the whole-file sha256."
  }
}
