{
  "current_level": "L2",
  "day_count": 2,
  "completed_cards": ["EN-001-001", "EN-001-002"],
  "next_dimension": "A",
  "dimension_cycle": ["A", "C", "B", "D"],
  "dimension_index": 2,
  "srs_review_pool": {},
  "streak_days": 2,
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  "underrun_count": 0,
  "overrun_threshold": 3,
  "underrun_threshold": 5,
  "created_at": "2026-06-16T22:38",
  "last_updated": "2026-06-17T11:30"
}