src/data/performance_demo_user.json

{
  "performance_history": [
    {
      "timestamp": "2024-01-01T10:00:00",
      "correct": true,
      "difficulty": "Medium",
      "topic": "Python programming"
    }
  ],
  "difficulty_scores": {
    "Easy": 0.85,
    "Medium": 0.65,
    "Hard": 0.45
  },
  "topic_performance": {
    "Python programming": {
      "attempts": 10,
      "correct": 8,
      "last_seen": "2024-01-01T10:00:00"
    }
  },
  "last_updated": "2024-01-01T10:00:00"
}