small tweaks

backend/app/api/v1/users.py

@@ -28,6 +28,15 @@ async def update_current_user_profile(
     """Update current user's profile"""
     update_data = user_update.model_dump(exclude_unset=True)
     
+    # Check email uniqueness if email is being updated
+    if 'email' in update_data and update_data['email'] != current_user.email:
+        existing_user = db.query(User).filter(User.email == update_data['email']).first()
+        if existing_user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered"
+            )
+    
     for field, value in update_data.items():
         setattr(current_user, field, value)