{
  "fixture": "V18-overlap-report-guide-r1",
  "timezone": "Asia/Tokyo",
  "segments": [
    {"id": "A", "start": "2026-09-01T09:00:00+09:00", "end": "2026-09-01T10:00:00+09:00"},
    {"id": "B", "start": "2026-09-01T09:30:00+09:00", "end": "2026-09-01T10:30:00+09:00"},
    {"id": "C", "start": "2026-09-01T09:45:00+09:00", "end": "2026-09-01T10:00:00+09:00"}
  ],
  "synthetic": true
}