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  "file": "2026-09-01T08.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-01/08",
  "hour_utc": "2026-09-01T08:00:00+00:00",
  "layout": "union-event-sorted-v1",
  "max_sequence": 53198776822450916,
  "merger_git_sha": "4b62fc9b20e966fbf2a7877895dbf6e0f609dfb6",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
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        "best_ask",
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        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53198776822450900,
      "min_sequence": 281486054869181,
      "order_by": [
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        "timestamp",
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      ],
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      "sha256": "166adb0a41f0abd7e8b1bee747a582b2e3ca0e29056470d0a7e2583a15e088d2"
    },
    "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": 53198776822450026,
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    "last_trade_price": {
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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": 53198776814222024,
      "min_sequence": 281486054872143,
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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": 53198776776858190,
      "min_sequence": 281486057294582,
      "order_by": [
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      ],
      "row_count": 973,
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      ],
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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": 53198776821937549,
      "min_sequence": 281486055262734,
      "order_by": [
        "market",
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        "sequence"
      ],
      "row_count": 2205,
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      ],
      "sha256": "91755806b6694a6452c363afccffd41b857127265dbf0533e5b719eb3cab95da"
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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": 53198776822450916,
      "min_sequence": 281486054869050,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 82707470,
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      ],
      "sha256": "7adbe88840d73597c1e5d1f886c2226a12add2ccb1ed6e0c1690c1b60ecb059b"
    },
    "tick_size_change": {
      "byte_range": [
        937279104,
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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": 53198776781010313,
      "min_sequence": 281486055860362,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 2228,
      "row_groups": [
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      ],
      "sha256": "99e2ce2e856e0749f5df8d175cc2cfaa26858cb1d34e47cb6df48b6009b55acb"
    }
  },
  "row_count": 91294797,
  "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: c, h, e)",
  "sha256": "f8bf7434d7314bdaa0aceb9d89c6f693a541b0f3df4091c2f4c8c5cbe1078be5",
  "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": "2026-09-01T08.witness_stats.json",
  "witnesses": "che",
  "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."
}