{
  "schemaVersion": "fidc-engine-optimization-rejection/v1",
  "generatedDate": "2026-09-07",
  "host": "192.168.31.177",
  "candidate": {
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    "implementationIdentitySha256": "a60aed1a405c1dc4713fdf72a379dcd07bc493998ec92c0aa0573c21ee863fc8",
    "description": "Keep the flat immutable quote base and merge a run-local lazy quote overlay through every DataSet quote API."
  },
  "revert": {
    "engineCommit": "728ed795b0c3b9bac9b7e79cb90e469c106e3629",
    "status": "deployed_and_healthy"
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  "measurements": {
    "currentCloseOneYear": {
      "acceptedHotMedianEngineSeconds": 0.722,
      "candidateHotMedianEngineSeconds": 0.858,
      "candidateHotMedianTotalSeconds": 1.56,
      "engineRegressionPercent": 18.836565
    },
    "nextBarOpenFiveYear": {
      "acceptedHotMedianEngineSeconds": 2.223,
      "candidateHotMedianEngineSeconds": 3.319,
      "candidateHotMedianTotalSeconds": 4.032,
      "engineRegressionPercent": 49.302744
    }
  },
  "correctness": {
    "totalReturnEqual": true,
    "tradeCountEqual": true,
    "canonicalResultDigestEqual": true,
    "resultStoreDigestEqual": true,
    "terminalAuditEqual": true,
    "candidateWorkspaceCoreTestsPassed": 442,
    "revertWorkspaceCoreTestsPassed": 441,
    "workspaceFailures": 0
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  "decision": {
    "status": "rejected_and_removed",
    "reason": "Public DataSet reads paid overlay branching and enlarged code paths even when no overlay existed; end-to-end regressions outweighed the avoided lazy-write clone.",
    "replacementDirection": "Build immutable shared Base Panels before engine execution. Any supplemental intraday store must be private to the broker/loader and must not alter generic DataSet read APIs."
  },
  "supportingEvidence": [
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/current-close-run-overlay-rejection-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/next-open-run-overlay-rejection-20260907.json"
  ]
}