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      ],
      "summaries": [
        {
          "column": "b",
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          "rows": 500000,
          "stock_median_seconds": 1.521209,
          "native_median_seconds": 1.55759,
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          "native_trials": [
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        },
        {
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          "native_trials": [
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        },
        {
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          "stock_median_seconds": 1.359729,
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          "stock_trials": [
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          "native_trials": [
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        }
      ]
    }
  },
  "bounded_rows_diagnostic": {
    "completed": false,
    "explanation": "Initial sequence completed binary running RANGE then was stopped during first stock bounded ROWS warmup under maintainer timebox. A thread dump records 31.609 CPU seconds in that stock task, stack at RowTimeRowsBoundedPrecedingFunction.onTimer. No bounded-frame acceleration claim is made. Completed running data remains above; no warmup or failed job discarded.",
    "stack": "over-count-end-watermark-2026-10-19.txt"
  },
  "claims": "The three measured running RANGE cases beat paired stock and actual prior fallback, with separated trial ranges. Other frames/types are correctness-verified, not covered by these throughput claims."
}