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  "boundary_guard": "cache",
  "bytes": 1002394863,
  "file": "2026-09-01T16.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-01/16",
  "hour_utc": "2026-09-01T16:00:00+00:00",
  "layout": "union-event-sorted-v1",
  "max_sequence": 53198777565987438,
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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": 53198777565987408,
      "min_sequence": 281486784036093,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 8441560,
      "row_groups": [
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      ],
      "sha256": "43187dc78d31c34c2b356f7228797f6ff329fdff736d015af77074c5733fa068"
    },
    "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": 53198777565987306,
      "min_sequence": 281486784036379,
      "order_by": [
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        "timestamp",
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      ],
      "sha256": "161a9280636dec7c27684c82cc987412f6003ce44f5a8b8094ed93557ff6d561"
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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": 53198777565986771,
      "min_sequence": 281486784037221,
      "order_by": [
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        "timestamp",
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    "market_resolved": {
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        128785724
      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53198777485799508,
      "min_sequence": 281486785750920,
      "order_by": [
        "market",
        "id",
        "timestamp",
        "sequence"
      ],
      "row_count": 1312,
      "row_groups": [
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        36
      ],
      "sha256": "8bfa85044c93def964eda95aa32f20db3cc81838885c2ce940140cf728bd4206"
    },
    "new_market": {
      "byte_range": [
        128785724,
        129125718
      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53198777558004429,
      "min_sequence": 281486784438945,
      "order_by": [
        "market",
        "id",
        "timestamp",
        "sequence"
      ],
      "row_count": 3181,
      "row_groups": [
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        37
      ],
      "sha256": "557284b7ae499f1f57c39caf816fcd209015af05ccd8e6e00b5b93002007b4cb"
    },
    "price_change": {
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        1001117087
      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53198777565987438,
      "min_sequence": 281486784035787,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 91707516,
      "row_groups": [
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        387
      ],
      "sha256": "54edcdb37a171696fb6338b4df56445792cb6c17fbedfd5e04eda9f53ecbd3c6"
    },
    "tick_size_change": {
      "byte_range": [
        1001117087,
        1001249668
      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53198777468626866,
      "min_sequence": 281486786669098,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 3738,
      "row_groups": [
        388,
        388
      ],
      "sha256": "ff6efd47ebd0853be19e9d13c8ffa76967979efe0f96bf57cfc73473ca6d1ea4"
    }
  },
  "row_count": 100534842,
  "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": "fb613d53295a2343fa2da3d8ab6b83782aac6ecb0afcb1ffd12dea69c716dafe",
  "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": "2026-09-01T16.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."
}