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    "tick_size_change": {
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      "witness_latency": {
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  },
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  "bytes": 1283148421,
  "file": "2026-09-06T10.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-06/10",
  "hour_utc": "2026-09-06T10:00:00+00:00",
  "layout": "union-event-sorted-v1",
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    "best_bid_ask": {
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      ],
      "columns": [
        "timestamp_received",
        "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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      ],
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      ],
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      "sha256": "df8c3c4b0650d4d6e87257fb91fce6328b37a3da84dd7a4d2a2f86a205a55c0b"
    },
    "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",
        "id",
        "assets_ids",
        "winning_asset_id",
        "winning_outcome",
        "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": 53761721496557255,
      "min_sequence": 562953011751077,
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      ],
      "row_count": 1426,
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    },
    "price_change": {
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
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        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 53761721504271892,
      "min_sequence": 562953010415908,
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        "timestamp",
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      ],
      "row_count": 107718472,
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      ],
      "sha256": "f1531a454c3c68edb98705bafec4f38c7877a83162e4e94d2dea1275c6c771f8"
    },
    "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": 53761721502887410,
      "min_sequence": 562953024615568,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 4600,
      "row_groups": [
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        469
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      "sha256": "90f1a393d2ecd94110940d6e86204c3242dffe8d32c97b5475ea7f99d46b5f33"
    }
  },
  "row_count": 121909317,
  "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": "85fee1d4292c001b70e3d6c6acb820070108793c5370fb50c1ef4ae9bf9b9a0d",
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    "manifest_sha256": "28fe2ad051b4195bb1ab7e4929d2b828c8185f1c863b0795db5b7784ddd6a843",
    "reason": "witnesses_added",
    "row_count_before": 121908124,
    "witnesses_before": "chfg"
  },
  "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": "2026-09-06T10.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."
}
