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      }
    },
    "tick_size_change": {
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      "class": "FULL",
      "exception_markets": 1252,
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      "rows_c": 4400,
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      "unique_by_domain": {
        "c": 0,
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        "h": 412,
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      "witness_latency": {
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      }
    }
  },
  "archive_root": "union-staging",
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  "bytes": 1590706418,
  "file": "2026-09-27T00.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-27/00",
  "hour_utc": "2026-09-27T00:00:00+00:00",
  "layout": "union-event-sorted-v1",
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  "merger_git_sha": "fcbb28046152741ae3754e951659977da4c8b36e",
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    "best_bid_ask": {
      "byte_range": [
        4,
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "best_bid",
        "best_ask",
        "spread",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019313512161,
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      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
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      ],
      "sha256": "6535330f715b7b6dc4a5105f32d9589f37c014af2fbc2a7e8e155b7175e4f96f"
    },
    "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": 370984019313512157,
      "min_sequence": 13510798986216563,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
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      ],
      "sha256": "de754ef801279aeaafed76e38ab34f25745363f0fed8d1cb88c6bea1f66b770a"
    },
    "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",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019313511097,
      "min_sequence": 13510798986257721,
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        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
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    },
    "market_resolved": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019313230908,
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        "timestamp",
        "sequence"
      ],
      "row_count": 5195,
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    },
    "new_market": {
      "byte_range": [
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019309210178,
      "min_sequence": 13510798996545014,
      "order_by": [
        "market",
        "id",
        "timestamp",
        "sequence"
      ],
      "row_count": 1052,
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        76
      ],
      "sha256": "7a1d79d551714d2af32518f441bc26653a4e5c9b4d0770140eb810f94d1bde7d"
    },
    "price_change": {
      "byte_range": [
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019313512253,
      "min_sequence": 13510798986168612,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 122837331,
      "row_groups": [
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        545
      ],
      "sha256": "73e6105d038722313e7b1c8a879f4a66b20998817c551a883170ffae805f6349"
    },
    "tick_size_change": {
      "byte_range": [
        1588881799,
        1589092454
      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 370984019308504813,
      "min_sequence": 14073748837292348,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 5748,
      "row_groups": [
        546,
        546
      ],
      "sha256": "6a55b55881a6554e128e1f7e4b3836e433399e77a0ddc7a5755782ceca7bbc87"
    }
  },
  "row_count": 142214687,
  "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: c, h, g, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "856166326fadd1f8703a271bb2b6f859f8995fc16dfaa950c6af8101c9cd33d1",
  "supersedes": {
    "manifest_sha256": "68600fbb24aa27534e7a9cdbc16ab4a787e7c374384e9915328a4437e24ba0ba",
    "reason": "witnesses_added",
    "row_count_before": 142139496,
    "witnesses_before": "chik"
  },
  "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": "2026-09-27T00.witness_stats.json",
  "witnesses": "chgik",
  "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."
}
