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    "tick_size_change": {
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  "archive_root": "union-staging",
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  "file": "2026-09-27T08.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
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  "hour_utc": "2026-09-27T08:00:00+00:00",
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      "columns": [
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        "timestamp",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "bids",
        "asks",
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        "arrival_skew",
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    "last_trade_price": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "fee_rate_bps",
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      "columns": [
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        "timestamp",
        "market",
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        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "witness_set",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
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      "sha256": "d03774d79a9932be13fd18f738ef46af90e1980f4a11cee19796ef3b932564e1"
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    "price_change": {
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      "columns": [
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        "timestamp",
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        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
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      ],
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    },
    "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": 376613518910486461,
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        "timestamp",
        "sequence"
      ],
      "row_count": 1800,
      "row_groups": [
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  },
  "row_count": 102626614,
  "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",
  "sha256": "50da297e44756798bdf31565cfda06091f8b4cd937cb5b6530a8a69f3eb76446",
  "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": "2026-09-27T08.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."
}
