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  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-01/21",
  "hour_utc": "2026-09-01T21:00:00+00:00",
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    "book": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
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        "asks",
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    "last_trade_price": {
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      "columns": [
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        "asset_id",
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        "size",
        "side",
        "fee_rate_bps",
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      "columns": [
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        "timestamp",
        "market",
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        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "witness_set",
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      "columns": [
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        "timestamp",
        "market",
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        "outcomes",
        "question",
        "slug",
        "witness_set",
        "arrival_skew",
        "source_witness"
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      "max_sequence": 53198778037613123,
      "min_sequence": 281487272386163,
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      "columns": [
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        "sequence",
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        "market",
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      "max_sequence": 53198778037621811,
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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": 281487350737731,
      "min_sequence": 281487273833746,
      "order_by": [
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        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 2176,
      "row_groups": [
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    }
  },
  "row_count": 80010651,
  "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": "ee4c5add7d23cda375beaeafa0833969059e3d7ad0c5bf246d20b4eb9316c4d3",
  "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": "2026-09-01T21.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."
}
