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    "products": {
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    "note": "Built by pendulumflow from its own canonical seven-file hour, which is unmodified and remains the source of record. Not upstream data.",
    "source_manifest": {
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          "class": "FULL",
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          "rows_by_domain": {
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        "book": {
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        "last_trade_price": {
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          "class": "NO-SOURCE",
          "rows_a": 0,
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          "rows_by_domain": {
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        "market_resolved": {
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          "rows_by_domain": {
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        "new_market": {
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          "rows_by_domain": {
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      "boundary_guard": "cache",
      "generated_by": "tools/orderbook_ab/merge_ab.py",
      "hour_utc": "2026-08-26T06:00:00+00:00",
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      "row_count": 215665,
      "sequence_note": "sequence and timestamp_received are collector-local provenance; common rows carry domain B's values",
      "witnesses": "abch"
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  },
  "verification": {
    "primary": "sha256sum <file> == .sha256",
    "secondary": "curl -r <start>-<end-1> <url> | sha256sum == .products.<name>.sha256",
    "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."
  }
}