Add User model

models/user.py

@@ -1,11 +1,30 @@
-from sqlalchemy import Column, String, Boolean
+from sqlalchemy import Column, String, Integer, Boolean, DateTime, ForeignKey, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
 from core.database import Base
+import uuid
+from datetime import datetime
 
 class User(Base):
     __tablename__ = "users"
-
-    id = Column(String, primary_key=True)
-    username = Column(String, unique=True, index=True)
-    email = Column(String, unique=True, index=True)
-    hashed_password = Column(String)
-    disabled = Column(Boolean, default=False)
+    
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    first_name = Column(String(50), nullable=False)
+    last_name = Column(String(50), nullable=False)
+    email = Column(String(100), unique=True, nullable=False, index=True)
+    password = Column(String, nullable=False)
+    role = Column(Enum('student', 'teacher', 'admin', name='user_roles'), nullable=False)
+    phone_number = Column(String(20))
+    address = Column(String(200))
+    date_of_birth = Column(DateTime)
+    profile_picture = Column(String)
+    is_active = Column(Boolean, default=True)
+    last_login = Column(DateTime)
+    
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+    
+    courses = relationship("Course", secondary="user_courses", back_populates="users")
+    assignments = relationship("Assignment", back_populates="user")
+    grades = relationship("Grade", back_populates="user")
+    attendance = relationship("Attendance", back_populates="user")