{
  "fixture": "V17-closing-period-worklog-r1",
  "timezone": "Asia/Tokyo",
  "period": {"start": "2026-08-21T00:00:00+09:00", "end": "2026-09-21T00:00:00+09:00", "interval": "[start,end)"},
  "included": ["B", "C"],
  "excluded": ["A", "D"],
  "unknown": ["U"],
  "included_seconds": 300,
  "rule": "include start, exclude end; unknown dates are not inferred"
}