{
  "schema": "anulum.change_receipt.v1",
  "example": true,
  "classification": "synthetic demonstration - not a production change",
  "created_at": "2026-07-29",
  "change_id": "SYNTH-CHANGE-007",
  "before": {
    "model": "example-model@version-1",
    "engine": "example-engine@version-4",
    "index": "example-index@version-7"
  },
  "after": {
    "model": "example-model@version-2",
    "engine": "example-engine@version-4",
    "index": "example-index@version-7"
  },
  "regression": {
    "contract": "benchmark-contract-example.json",
    "status": "specimen - no result claimed",
    "negative_findings": []
  },
  "approval": "client change owner required",
  "rollback_target": "example-model@version-1"
}