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  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-01/17",
  "hour_utc": "2026-09-01T17:00:00+00:00",
  "layout": "union-event-sorted-v1",
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      "order_by": [
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    "book": {
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "bids",
        "asks",
        "witness_set",
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    "last_trade_price": {
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      "columns": [
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        "sequence",
        "timestamp",
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        "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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        "source_witness"
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      "sha256": "08c80dbb4b37e866de216a99cbcd34a8d4aee2780541e4055f33740897988e44"
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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": 53198777662414669,
      "min_sequence": 281486883942374,
      "order_by": [
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      "row_count": 1986,
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      ],
      "sha256": "3e5e1b2110cd316459f60c55a1c7e037a6023c36cf3f6bd5461dfdd1bebd9d73"
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    "price_change": {
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      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "price",
        "size",
        "side",
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        "best_ask",
        "witness_set",
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        "source_witness"
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      "max_sequence": 53198777671671239,
      "min_sequence": 281486883496558,
      "order_by": [
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      "sha256": "adb16a539e79aa56a9b4419fee4cb2e99f15ee6b3f91cd7d91c5260c3c1b9ed3"
    },
    "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": 281486988305826,
      "min_sequence": 281486885176077,
      "order_by": [
        "market",
        "asset_id",
        "timestamp",
        "sequence"
      ],
      "row_count": 3244,
      "row_groups": [
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      "sha256": "bbd4e85d21191c7d6bff7c9aea9ee99ab0a93dd356dcb6d848ea9f3344bb9f28"
    }
  },
  "row_count": 106016569,
  "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: c, h, e)",
  "sha256": "19ab9d2297abc55c4e743a71d2a6e0643a77dadb07cd9d4f1d983e04b7c7d5c0",
  "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": "2026-09-01T17.witness_stats.json",
  "witnesses": "che",
  "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."
}