{
  "tenant_id": "tenant-123",
  "delivery_id": "00000000-0000-4000-8000-000000000001",
  "channel": "email",
  "subject": "User signup",
  "body": "User john@example.com joined",
  "redacted_body": "User ***@example.com joined",
  "pii_hash": "TBD"
}