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    },
    "tick_size_change": {
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      "exception_markets": 101,
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      "rows_c": 1924,
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      "witness_latency": {
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      }
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  },
  "archive_root": "union-staging",
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  "bytes": 1205323247,
  "file": "2026-09-22T21.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-22/21",
  "hour_utc": "2026-09-22T21:00:00+00:00",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "best_bid",
        "best_ask",
        "spread",
        "witness_set",
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    "book": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "bids",
        "asks",
        "witness_set",
        "arrival_skew",
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      "sha256": "bcc06487e9c3a79a0171b4f571511d471e6654f7bf9ca229b5b11bce59ce6f8d"
    },
    "last_trade_price": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "fee_rate_bps",
        "transaction_hash",
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
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        "assets_ids",
        "winning_asset_id",
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        "witness_set",
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    },
    "new_market": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "id",
        "assets_ids",
        "outcomes",
        "question",
        "slug",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 305118874794956498,
      "min_sequence": 562950151556480,
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      ],
      "row_count": 10926,
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      "sha256": "bab4161878fa8d4a5712295a63cee19644f5b726aa613e20a2eb240983b3058b"
    },
    "price_change": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 305118874796122057,
      "min_sequence": 562950151234140,
      "order_by": [
        "market",
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        "timestamp",
        "sequence"
      ],
      "row_count": 94720398,
      "row_groups": [
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      "sha256": "a5406f3bd70044ac59551bfe89ca02a3a361c61578617572d871aaab773d10cf"
    },
    "tick_size_change": {
      "byte_range": [
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 305118874795393152,
      "min_sequence": 562950165074872,
      "order_by": [
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        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 2256,
      "row_groups": [
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      "sha256": "6d6b068427c4e264448a93f850cf40d617eab2de94bc9e9917778238328c7c41"
    }
  },
  "row_count": 107750629,
  "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, f, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "e3773140fc67bd06a85e83056bf1efd5ee703ed6cbb504665aaa833dcca7688e",
  "supersedes": {
    "manifest_sha256": "fb52d7913a7303210dde0b0273a7b3d6dec0b93bb325bfb9b05f2748db2e06a5",
    "reason": "re_merge",
    "row_count_before": 107753246,
    "witnesses_before": "chfik"
  },
  "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": "2026-09-22T21.witness_stats.json",
  "witnesses": "chfik",
  "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."
}
