{
  "schemaVersion": 1,
  "generatedAt": "2026-07-21",
  "environment": {
    "platform": "darwin",
    "arch": "arm64",
    "cpu": "Apple M4 Pro",
    "postgres": "18.2 local Docker container"
  },
  "fixture": {
    "blobs": 1000000,
    "sampleSize": 100,
    "hashShape": "two concatenated MD5 hex digests",
    "middleSampleCount": 100,
    "wraparoundSampleCount": 100
  },
  "orderByRandom": {
    "samplesMs": [111.796, 103.906, 93.862, 88.090, 100.442],
    "medianMs": 100.442
  },
  "indexedHashRing": {
    "samplesMs": [0.474, 0.323, 0.376, 0.267, 0.491],
    "medianMs": 0.376
  },
  "speedup": 267.13,
  "statisticalReview": {
    "orderedHashFailureRangePercent": 1,
    "contiguousWindowDetectionProbabilityPercent": 1,
    "independentSamplesDetectionProbabilityPercent": 63.4,
    "reason": "A single random-pivot successor window is gap-biased and its 100 rows are correlated. It does not preserve ORDER BY random() detection power for localized or prefix/backend failures."
  },
  "decision": "rejected; production reverted despite 267.13x query speed because verification semantics regressed"
}