{
  // This example demonstrates common validation errors:
  // 1. Missing required fields (email)
  // 2. Invalid ID format
  // 3. Username too short
  // 4. Invalid email format
  // 5. Age outside valid range
  // 6. Invalid theme value
  // 7. Invalid role
  // 8. Invalid date format
  "id": "user123",  // Should start with 'usr_' and have 8 alphanumeric chars
  "username": "jd",  // Too short, minimum 3 chars
  "email": "not-an-email",  // Invalid email format
  "profile": {
    "fullName": "John Doe",
    "age": 150,  // Too old, maximum 120
    "avatar": "not-a-url"  // Invalid URL format
  },
  "preferences": {
    "theme": "blue",  // Not in enum: light, dark, system
    "notifications": {
      "email": "yes",  // Should be boolean
      "push": null,  // Should be boolean
      "sms": "maybe"  // Should be boolean
    }
  },
  "roles": ["user", "superadmin"],  // 'superadmin' not in enum
  "metadata": {
    "createdAt": "2024-01-15",  // Should be ISO 8601 date-time
    "lastLogin": "yesterday",  // Should be ISO 8601 date-time
    "version": "1"  // Should match pattern ^\d+\.\d+\.\d+$
  }
}