Removed findById() method. It's provided by JpaRepository

Author: Rajeev Kumar Singh

polling-app-server/src/main/java/com/example/polls/repository/UserRepository.java

@@ -18,8 +18,6 @@ public interface UserRepository extends JpaRepository<User, Long> {
 
     List<User> findByIdIn(List<Long> userIds);
 
-    Optional<User> findById(Long userId);
-
     Optional<User> findByUsername(String username);
 
     Boolean existsByUsername(String username);