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  "generated_by": "tools/orderbook_ab/merge_ab.py",
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      "columns": [
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    "last_trade_price": {
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      "columns": [
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      "columns": [
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        "timestamp",
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      ],
      "max_sequence": 62768920607082464,
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      "columns": [
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      "columns": [
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        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
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      ],
      "max_sequence": 62768920599940060,
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      ],
      "row_count": 4588,
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    }
  },
  "row_count": 106228453,
  "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: h, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "b8471a7dd7fa72b97b04fbf66a465a298a4245422a2a08bce2bbb68b8adc26e1",
  "skipped_witnesses": {
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      "alive": false,
      "listed_utc": "2026-09-25T21:35:13.910816Z",
      "newest_upload": "2026-09-25T11:20:09.612000Z",
      "reason": "not_staged"
    },
    "g": {
      "alive": false,
      "listed_utc": "2026-09-25T21:35:30.905006Z",
      "newest_upload": "2026-09-25T15:20:05.378000Z",
      "reason": "not_staged"
    }
  },
  "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": "2026-09-25T20.witness_stats.json",
  "witnesses": "hik",
  "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."
}