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    "tick_size_change": {
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      "class": "PARTIAL",
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      "rows_merged": 1912,
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      "witness_latency": {
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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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        "outcomes",
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      "columns": [
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      "columns": [
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        "sequence",
        "timestamp",
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        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
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  },
  "row_count": 110772299,
  "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, g). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "6da9ff82ca04824de6bb0f2fb9054aa3657b5288796129cce4c6b473f9b1b6b6",
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      "listed_utc": "2026-09-12T00:42:52.047744Z",
      "newest_upload": "2026-09-11T18:20:04.937000Z",
      "reason": "not_staged"
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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": "2026-09-11T22.witness_stats.json",
  "witnesses": "cheg",
  "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."
}
