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  "generated_by": "tools/orderbook_ab/merge_ab.py",
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      "columns": [
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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",
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      ],
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  },
  "row_count": 117937560,
  "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: c, h, f, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
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      "first_ts": "2026-05-29T22:22:35.469000Z",
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      "last_ts": "2026-09-23T09:59:59.926000Z",
      "rows": 115160043
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  },
  "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": "2026-09-23T09.witness_stats.json",
  "witnesses": "chfik",
  "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."
}
