{
  "schemaVersion": "fidc-engine-optimization-rejection/v1",
  "generatedDate": "2026-09-07",
  "host": "192.168.31.177",
  "candidate": {
    "engineCommit": "f2de8b281a7f9537665d86895f8c51fb33386d9e",
    "implementationIdentitySha256": "1ea0d2834901504e79d76d9df722f009a2ced3c2a02ddf247eae8722be135516",
    "description": "Store execution quote dates, symbol maps and quote vectors as nested Arc values so a lazy write clones only one path."
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    "implementationIdentitySha256": "4f81eb707baeb76375a03eb8989cb043089b1a7c1d07a998570861eb7dc6fa95",
    "description": "Restore the flat read-optimized execution quote index."
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  "measurements": {
    "currentCloseOneYear": {
      "candidateHotMedianTotalSeconds": 1.19,
      "candidateHotMedianEngineSeconds": 0.652,
      "revertHotMedianTotalSeconds": 1.183,
      "revertHotMedianEngineSeconds": 0.722,
      "candidateEngineImprovementPercent": 9.695291
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    "nextBarOpenFiveYear": {
      "candidateHotMedianTotalSeconds": 2.896,
      "candidateHotMedianEngineSeconds": 2.25,
      "revertHotMedianTotalSeconds": 2.848,
      "revertHotMedianEngineSeconds": 2.223,
      "candidateEngineRegressionPercent": 1.214575
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    "staticCurrentClose": {
      "candidateHotMedianEngineSeconds": 0.324,
      "acceptedFlatIndexHotMedianEngineSeconds": 0.322
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    "fullMinute": {
      "candidateHotMedianEngineSeconds": 0.225,
      "acceptedFlatIndexHotMedianEngineSeconds": 0.226
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  "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": "Nested Arc indirection improves the lazy-write strategy but causes a repeatable next_bar_open regression and has no static/full-minute read benefit.",
    "replacementDirection": "Keep the flat immutable base index and isolate lazy additions in a run-local overlay without changing the base iterator representation."
  },
  "supportingEvidence": [
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/current-close-layered-quote-index-rejection-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/static-pool-layered-quote-index-rejection-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/full-minute-layered-quote-index-rejection-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/next-open-layered-quote-index-rejection-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/current-close-after-layered-index-revert-20260907.json",
    "/Users/boris/WorkSpace/fidc-backtest-service/docs/evidence/next-open-after-layered-index-revert-20260907.json"
  ]
}