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        },
        "k": {
          "buckets_ms": {
            "0_1ms": 0,
            "10000_30000ms": 0,
            "1000_2000ms": 0,
            "100_200ms": 86,
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            "200_500ms": 48,
            "20_50ms": 506,
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            "500_1000ms": 0,
            "50_100ms": 135,
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        }
      }
    }
  },
  "archive_root": "union-staging",
  "boundary_guard": "cache",
  "bytes": 1320127046,
  "file": "2026-09-26T00.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-26/00",
  "hour_utc": "2026-09-26T00:00:00+00:00",
  "layout": "union-event-sorted-v1",
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    "best_bid_ask": {
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
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        "asset_id",
        "best_bid",
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        "spread",
        "witness_set",
        "arrival_skew",
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      ],
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      "order_by": [
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      ],
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      ],
      "sha256": "d1ed72747492a5e3c44d6d5502475e6179670c01ecb4a5c4e209522a8d9f28b0"
    },
    "book": {
      "byte_range": [
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "bids",
        "asks",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 63331870085874412,
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      ],
      "sha256": "5695430e4e66cf327dd7420dd093b1a4251f57b3d34bd2469837f343e7894d43"
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    "last_trade_price": {
      "byte_range": [
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "fee_rate_bps",
        "transaction_hash",
        "witness_set",
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        "source_witness"
      ],
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "witness_set",
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        "source_witness"
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    "new_market": {
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 63331870085697956,
      "min_sequence": 9851624731001004,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 2793,
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      ],
      "sha256": "00bb5888b26de8b41ba4f5e03a08d6ae5f34f38f1c2842e78627bc58eff3cb52"
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    "price_change": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
        "witness_set",
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        "source_witness"
      ],
      "max_sequence": 63331870085902238,
      "min_sequence": 9851624730260006,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 109594246,
      "row_groups": [
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      ],
      "sha256": "95c4246f48b7e43e2f4aa407bfa856fd93adc6b606be6d9ef9a1fb2298be4abe"
    },
    "tick_size_change": {
      "byte_range": [
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 63331870085467331,
      "min_sequence": 9851624730262552,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 5372,
      "row_groups": [
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        475
      ],
      "sha256": "f1f5bbb4bcc94af4f09204a2b3a70bd7ecc29436d72dcd570663a3fd45acd2c8"
    }
  },
  "row_count": 123235313,
  "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the EARLIEST-RECEIVED copy, equal arrivals breaking by registry order (active: h, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "c3e574c78d9a324dda2ebef52d44e553cdb3946c18211dd5f69df4060f4bc533",
  "skipped_witnesses": {
    "c": {
      "alive": false,
      "listed_utc": "2026-09-26T02:20:14.660701Z",
      "newest_upload": "2026-09-25T11:20:09.612000Z",
      "reason": "not_staged"
    },
    "g": {
      "alive": false,
      "listed_utc": "2026-09-26T02:20:31.900186Z",
      "newest_upload": "2026-09-25T15:20:05.378000Z",
      "reason": "not_staged"
    }
  },
  "verification": {
    "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.",
    "primary": "sha256sum <file> == .sha256",
    "secondary": "curl -r <start>-<end-1> <url> | sha256sum == .products.<name>.sha256"
  },
  "witness_stats": "2026-09-26T00.witness_stats.json",
  "witnesses": "hik",
  "served_verbatim": true,
  "served_note": "This hour is the merger's union file, published byte for byte. Hours before the era cutover are rebuilt here from the seven product files and carry one column fewer."
}