{
  "user_id": "bob",
  "plan_id": "plan_bob_001",
  "title": "Semana introdutória",
  "created_at": "2025-10-13T12:15:00Z",
  "sessions": [
    {"day": 1, "focus": "leitura: textos curtos", "duration_minutes": 25},
    {"day": 2, "focus": "flashcards: verbos comuns", "duration_minutes": 20}
  ]
}