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    "tick_size_change": {
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  "archive_root": "union-staging",
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  "bytes": 1191589019,
  "file": "2026-09-23T22.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
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  "hour_utc": "2026-09-23T22:00:00+00:00",
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      "columns": [
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        "timestamp",
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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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        "timestamp",
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        "assets_ids",
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      "columns": [
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        "sequence",
        "timestamp",
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        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
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      "columns": [
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        "timestamp",
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        "asset_id",
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        "size",
        "side",
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        "best_ask",
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    },
    "tick_size_change": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
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      "max_sequence": 323414748272388137,
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      ],
      "row_count": 3144,
      "row_groups": [
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  },
  "row_count": 111575054,
  "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, g, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
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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": "2026-09-23T22.witness_stats.json",
  "witnesses": "chgik",
  "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."
}
