{
  "synthetic": true,
  "decisionAt": "2026-09-15T12:00:00Z",
  "expectedSummary": { "required": 3, "withinPolicy": 1, "stale": 1, "unknown": 1, "metadataMissing": 0 },
  "expectedRows": [
    {
      "datasetId": "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa",
      "status": "stale",
      "reason": "threshold_exceeded",
      "ageSeconds": 108000
    },
    {
      "datasetId": "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb",
      "status": "within_policy",
      "reason": "within_threshold",
      "ageSeconds": 3600
    },
    {
      "datasetId": "cccccccc-cccc-4ccc-8ccc-cccccccccccc",
      "status": "unknown",
      "reason": "no_successful_commit",
      "ageSeconds": null
    }
  ],
  "note": "Expected teaching results specified before the checker. These are not observed production results. Source health and upstream coverage are separate from timestamp age."
}