{
  "subjectId": "usr_sample_002",
  "note": "Fictional SAMPLE messages \u2014 not real correspondence.",
  "messages": [
    {
      "id": "msg_1",
      "ts": "2026-01-05T10:00:00Z",
      "channel": "email",
      "body": "SAMPLE support question"
    },
    {
      "id": "msg_2",
      "ts": "2026-01-06T11:00:00Z",
      "channel": "email",
      "body": "SAMPLE follow-up"
    }
  ]
}