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  },
  "archive_root": "union-staging",
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  "file": "2026-09-18T05.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
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  "hour_utc": "2026-09-18T05:00:00+00:00",
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      "columns": [
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      "columns": [
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        "sequence",
        "timestamp",
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        "asset_id",
        "bids",
        "asks",
        "witness_set",
        "arrival_skew",
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    "last_trade_price": {
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      "columns": [
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        "size",
        "side",
        "fee_rate_bps",
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      "columns": [
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        "winning_asset_id",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
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        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
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      "sha256": "59acced10f39b4bf4cb79d2c359adae1f1a3ece9e194279244057b075ff65846"
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      "columns": [
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        "sequence",
        "timestamp",
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        "asset_id",
        "price",
        "size",
        "side",
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        "best_ask",
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      "sha256": "45d9baedf6b52e674a7e7c75fe7e079f32dbfebc62149f75f1ef80e33a18a30c"
    },
    "tick_size_change": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
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      "max_sequence": 234750130979119137,
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        "timestamp",
        "sequence"
      ],
      "row_count": 2440,
      "row_groups": [
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      "sha256": "4865c313a36ca9ab29e8810a6b7345ca448d2ebcb31281e74fe3d32af8a66151"
    }
  },
  "row_count": 106014288,
  "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": "4a7e253b3631518c10855ec0a05f6d43c72aca30f293169cae11f2df0d975ef2",
  "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": "2026-09-18T05.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."
}
