{
  "source_id": "src_warehouse",
  "items": [
    {
      "operation": "customer.upsert",
      "external_id": "C-1042",
      "source_version": 42,
      "source_updated_at": "2026-09-12T10:00:00Z",
      "customer": {
        "name": "Cedar Works",
        "type": "company",
        "email": "hello@cedar.example",
        "industry": "Professional services"
      }
    },
    {
      "operation": "observation.upsert",
      "external_id": "contract-778-renewal",
      "customer_external_id": "C-1042",
      "source_version": 7,
      "source_updated_at": "2026-09-12T10:00:00Z",
      "observation": {
        "attribute": "renewal_date",
        "value": "2026-10-10",
        "effective_at": "2026-09-12T09:00:00Z",
        "confidence": "Verified",
        "context": "Contract register, contract 778"
      }
    }
  ]
}