Add User model

models/user.py

@@ -1,17 +1,24 @@
-from sqlalchemy import Column, String, Integer, Boolean, DateTime, ForeignKey
+from sqlalchemy import Column, String, Integer, Boolean, DateTime, ForeignKey, Enum
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
+from sqlalchemy.dialects.postgresql import UUID
 from core.database import Base
 import uuid
 from datetime import datetime
 
 class User(Base):
     __tablename__ = "users"
-    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
-    username = Column(String, unique=True, nullable=False, index=True)
-    email = Column(String, unique=True, nullable=False)
-    password = Column(String, nullable=False)
-    full_name = Column(String, nullable=False)
-    is_active = Column(Boolean, default=True)
-    created_at = Column(DateTime, default=func.now())
-    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+    
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    username = Column(String(50), unique=True, nullable=False, index=True)
+    email = Column(String(255), unique=True, nullable=False, index=True)
+    password = Column(String(255), nullable=False)
+    first_name = Column(String(50), nullable=True)
+    last_name = Column(String(50), nullable=True)
+    phone_number = Column(String(20), unique=True, nullable=True)
+    role = Column(Enum('admin', 'user', name='user_roles'), default='user')
+    is_active = Column(Boolean, default=True, nullable=False)
+    is_verified = Column(Boolean, default=False, nullable=False)
+    last_login = Column(DateTime, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)