✨ Add created_at field to User and Item models and update endpoints (#2144)

backend/app/api/routes/users.py

@@ -42,7 +42,7 @@ def read_users(session: SessionDep, skip: int = 0, limit: int = 100) -> Any:
     count_statement = select(func.count()).select_from(User)
     count = session.exec(count_statement).one()
 
-    statement = select(User).offset(skip).limit(limit)
+    statement = select(User).order_by(User.created_at.desc()).offset(skip).limit(limit)
     users = session.exec(statement).all()
 
     return UsersPublic(data=users, count=count)