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          "buckets_ms": {
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  },
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  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-25/23",
  "hour_utc": "2026-09-25T23:00:00+00:00",
  "layout": "union-event-sorted-v1",
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      ],
      "columns": [
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        "timestamp",
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      ],
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      "sha256": "230d9f3aba841e696d10701a1fb072ec012d43c45df8f35156d196a375030e01"
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    "book": {
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      ],
      "columns": [
        "timestamp_received",
        "sequence",
        "timestamp",
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        "asset_id",
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        "asks",
        "witness_set",
        "arrival_skew",
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      ],
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      "sha256": "63d5207e69cd6f30dd979fa0f06353e54343eda96e345879804d4ce2b403e7f2"
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    "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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        "source_witness"
      ],
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
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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": 63331869962519489,
      "min_sequence": 9851624605482336,
      "order_by": [
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        "sequence"
      ],
      "row_count": 1827,
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      "sha256": "35ae71c0ef45e08b2933e208f95af82e1489ef70483373022d50b7a09e27771a"
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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",
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        "source_witness"
      ],
      "max_sequence": 63331869963779841,
      "min_sequence": 9851624605404442,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 112588086,
      "row_groups": [
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      ],
      "sha256": "b2c67c3b342ea0da3b911136d61c73896b7587491cfa8ed6e03984da51620d9c"
    },
    "tick_size_change": {
      "byte_range": [
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      ],
      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
      ],
      "max_sequence": 63331869956737761,
      "min_sequence": 9851624606131290,
      "order_by": [
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        "timestamp",
        "sequence"
      ],
      "row_count": 3520,
      "row_groups": [
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      ],
      "sha256": "4bdf70a8d9a8fd8936149d16e178239e10174d31f74c7c5f154eea28f13d129c"
    }
  },
  "row_count": 126045735,
  "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: h, i, k). The winner is per row, not per hour -- each row names its own in source_witness",
  "sha256": "1c6c6f46ed8802171b58b24fd3a883ff55a07b738253c29b65539a65caaa8946",
  "skipped_witnesses": {
    "c": {
      "alive": false,
      "listed_utc": "2026-09-26T01:02:37.178495Z",
      "newest_upload": "2026-09-25T11:20:09.612000Z",
      "reason": "not_staged"
    },
    "g": {
      "alive": false,
      "listed_utc": "2026-09-26T01:02:53.163989Z",
      "newest_upload": "2026-09-25T15:20:05.378000Z",
      "reason": "not_staged"
    }
  },
  "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": "2026-09-25T23.witness_stats.json",
  "witnesses": "hik",
  "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."
}