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      "witness_latency": {
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  "archive_root": "union-staging",
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  "bytes": 1069199781,
  "file": "2026-09-28T00.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-28/00",
  "hour_utc": "2026-09-28T00:00:00+00:00",
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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",
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        "asset_id",
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        "size",
        "side",
        "fee_rate_bps",
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      "columns": [
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        "timestamp",
        "market",
        "id",
        "assets_ids",
        "winning_asset_id",
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        "witness_set",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
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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": 396035292520561397,
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      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 3348,
      "row_groups": [
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      "sha256": "5f83967220df6807072caa2455e29dde4a7d17e8c5b526b9c407d76ae5cccc9b"
    }
  },
  "row_count": 104679306,
  "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": "297552095667fe4623c648695e2a9f9cb2ceae5253b9b2ceade874fdee99d091",
  "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": "2026-09-28T00.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."
}
