code: public function delete(int $id, AuthenticationService $authentication, AuthorizationService $authorization): string
      {
          // make sure there is an administrator for the primary key
          if (null === $administrator = $this->getObjectById($id)) {
              throw new Exceptions\QueryResultsNotFoundException();
          }
  
          $administrator->setAuth($authentication, $authorization);
  
          if (!$administrator->isDeletable()) {
              throw new Exceptions\UnallowedActionException($administrator->getNotDeletableReason());
          }
  
          $this->doDeleteTransaction($id);
  
          $username = $administrator->getUsername();
          unset($administrator);
  
          return $username;
      }
docs: does validation for delete then deletes and returns deleted username