update error

backend/models/dashboard_models.py

@@ -0,0 +1,42 @@
+from datetime import datetime
+from typing import List, Optional, Dict
+from pydantic import BaseModel
+
+class UserStats(BaseModel):
+    user_id: str
+    total_points: int = 0
+    current_streak: int = 0
+    longest_streak: int = 0
+    rank: int = 999
+    total_courses: int = 0
+    completed_courses: int = 0
+    total_quizzes: int = 0
+    total_coding_challenges: int = 0
+    created_at: datetime = datetime.now()
+    updated_at: datetime = datetime.now()
+
+class UserProfile(BaseModel):
+    user_id: str
+    name: str
+    bio: str = ""
+    profile_pic: str = "/default-avatar.png"
+    join_date: datetime = datetime.now()
+    badges: List[str] = []
+    social_links: Dict[str, str] = {}
+
+class ActivityRecord(BaseModel):
+    user_id: str
+    activity_type: str  # 'course', 'quiz', 'coding', 'achievement'
+    title: str
+    score: Optional[int] = None
+    points_earned: int = 0
+    date: datetime = datetime.now()
+    blockchain_hash: Optional[str] = None
+
+class BlockchainTransaction(BaseModel):
+    tx_hash: str
+    amount: float
+    transaction_type: str  # 'reward', 'certificate', 'achievement'
+    description: str
+    timestamp: datetime = datetime.now()
+    confirmed: bool = False