{
  "schemaVersion": "fidc-duplicate-rolling-lookback-rejection/v1",
  "measuredAt": "2026-09-05T01:05:00+08:00",
  "host": "192.168.31.177",
  "candidateCommits": [
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  "revertCommit": "5b2a03d416a7bd709680a1adf52013e3eadc199a",
  "candidate": {
    "description": "reuse equal lookback values only inside one AdjustedCloseSeries moving_averages_at_end call",
    "validComponentBenchmark": {
      "samples": 6,
      "iterationsPerSample": 3000000,
      "lookbacks": [1, 2, 3, 1, 2, 3, 1],
      "repeatedSeconds": 1.40643611,
      "reusedSeconds": 0.853281932,
      "speedup": 1.6482666012902287,
      "checksum": 1458000000.0
    },
    "hardwareCounters": {
      "runId": "btr_1788541184367_2862338_11",
      "engineSeconds": 8.423,
      "taskClockMilliseconds": 9030.56,
      "cycles": 22931608591,
      "instructions": 28199702874,
      "branches": 5010114942,
      "branchMisses": 23586244,
      "cacheReferences": 268428800,
      "cacheMisses": 146632717
    }
  },
  "restoredBaseline": {
    "warmupRunId": "btr_1788541416661_2890172_0",
    "warmupEngineSeconds": 5.581,
    "hardwareCounters": {
      "runId": "btr_1788541455567_2890172_1",
      "engineSeconds": 6.078,
      "taskClockMilliseconds": 6643.43,
      "cycles": 16773013609,
      "instructions": 28218847364,
      "branches": 5024236708,
      "branchMisses": 23209586,
      "cacheReferences": 266316407,
      "cacheMisses": 81226408
    },
    "runnerBinarySha256": "188269bf0c2ee65d6c11ed37ddddfdaf86695941e8123f69f950054bea39796e"
  },
  "comparison": {
    "candidateInstructionReductionPercent": 0.06784229696471904,
    "candidateBranchReductionPercent": 0.2810720756590066,
    "materialSystemImprovementProven": false,
    "wallTimeComparable": false,
    "reason": "host-wide thermal and external workload changes produced materially different cache-miss and clock conditions; the instruction reduction itself is below one tenth of one percent"
  },
  "businessContract": {
    "startDate": "2021-08-23",
    "endDate": "2026-08-28",
    "frequency": "1d",
    "matchingType": "next_bar_open",
    "totalReturn": 0.9219861819172002,
    "tradeCount": 26088,
    "canonicalSha256": "b42fea66237d06eadb24f6b8c9e2760e7319fe3699f315b99e01f433ef2aa234",
    "resultStoreSha256": "92343fb369fea68b2544b654151c5c43a935940580b14afbe8eefb3844f72a54",
    "allRunsConsistent": true
  },
  "remoteArtifacts": [
    "/srv/fidc/canonical/run/fidc-private/evidence/duplicate-lookback-20260905.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/duplicate-lookback-low-contention-20260905.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/duplicate-lookback-perf-stat-candidate-20260905/perf-stat.csv",
    "/srv/fidc/canonical/run/fidc-private/evidence/duplicate-lookback-perf-stat-baseline-20260905/perf-stat.csv"
  ],
  "decision": {
    "status": "rejected_and_removed",
    "reason": "the valid microbenchmark improves, but the real five-year workload saves only about 0.068 percent instructions and provides no measurable system-level benefit",
    "productionEngineCommit": "5b2a03d416a7bd709680a1adf52013e3eadc199a"
  }
}