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  "generated_by": "tools/orderbook_ab/merge_ab.py",
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        "assets_ids",
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      "columns": [
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        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
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      "max_sequence": 132574714034019772,
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      "columns": [
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      ],
      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 50946971357848558,
      "min_sequence": 281478179900297,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 4448,
      "row_groups": [
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      "sha256": "0ce1b48a24d32358a74b5a9675addd47e169aec529b6de4dfbc07e88a87c7276"
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  },
  "row_count": 119349950,
  "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: a, b, c, h, e)",
  "sha256": "f8adc4edf3d82a3fd31c68c1ae89b112e2b6b7b4ff4066d88a4890b0a116fa7a",
  "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"
  },
  "witnesses": "abche",
  "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."
}