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    },
    "tick_size_change": {
      "boundary_dropped": 0,
      "class": "FULL",
      "exception_markets": 77,
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      "rows_by_domain": {
        "b": 1836,
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      },
      "rows_c": 1616,
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      "rows_joined": 1868,
      "rows_merged": 1868,
      "witness_latency": {
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  },
  "archive_root": "union-staging",
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  "bytes": 999386158,
  "file": "2026-09-03T06.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-03/06",
  "hour_utc": "2026-09-03T06:00:00+00:00",
  "layout": "union-event-sorted-v1",
  "max_sequence": 162692536979563410,
  "merger_git_sha": "unknown: MERGER_GIT_SHA malformed (not 40-hex)",
  "min_sequence": 281490102294200,
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      "columns": [
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        "witness_set",
        "arrival_skew",
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    "book": {
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      "columns": [
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        "asset_id",
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        "arrival_skew",
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    "last_trade_price": {
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      "columns": [
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        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "fee_rate_bps",
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      "columns": [
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        "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"
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      "max_sequence": 162692536975699240,
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      "row_count": 1338,
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      "sha256": "416ea284dce1441ede91cc517c9b5a24f5dd4c7d19ebfe8f218299657935e194"
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    "price_change": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
        "best_bid",
        "best_ask",
        "witness_set",
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      "max_sequence": 162692536956696602,
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      "order_by": [
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        "timestamp",
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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"
      ],
      "max_sequence": 281490193188565,
      "min_sequence": 281490104688399,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 1868,
      "row_groups": [
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      "sha256": "079f8e2c4893d66a9d7029731ce4fac46e40fde5257c6173a430f5226df1baea"
    }
  },
  "row_count": 93499394,
  "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the LAST ACTIVE domain's values -- for this hour, domain e (active: b, c, h, e)",
  "sha256": "90a1c8f02332b9135403c6023fe29c8807ecc4453d972a56cb4178c251ee95b3",
  "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": "2026-09-03T06.witness_stats.json",
  "witnesses": "bche",
  "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."
}
