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  "file": "2026-09-20T19.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
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  "hour_utc": "2026-09-20T19:00:00+00:00",
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        "timestamp",
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      "columns": [
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      "columns": [
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        "fee_rate_bps",
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      "columns": [
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      "columns": [
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        "outcomes",
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      "columns": [
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        "size",
        "side",
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        "best_ask",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
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      "max_sequence": 281474976718921910,
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      ],
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    }
  },
  "row_count": 141731654,
  "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, e, f, g). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "ab4887524240c59ac7bf5c9e6e4b34f5e8763a747da64710cf54b9fdbf4c0da0",
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    "reason": "witnesses_added",
    "row_count_before": 141405793,
    "witnesses_before": "chef"
  },
  "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": "2026-09-20T19.witness_stats.json",
  "witnesses": "chefg",
  "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."
}
