public List<User> saveUsers(Collection<User> users) {
   return userRepository.saveUsers(users);
 }
 public Long getNumberOfUsers() {
   return userRepository.getNumberOfUsers();
 }
 public void setUsersCrawled(Collection<User> crawledUsers) {
   userRepository.setUsersCrawled(crawledUsers);
 }
 public List<User> getUsersForCrawl(int numberOfUsers) {
   return userRepository.getUsersForCrawl(numberOfUsers);
 }
 public User getUserByUsername(String username) {
   return userRepository.getUserByUsername(username);
 }
 public User saveUser(User user) {
   return userRepository.saveUser(user);
 }
 public User getUserById(Long id) {
   return userRepository.getUserById(id);
 }