code: def upsert_users(cursor, user_ids):
      
      accounts = get_current_registry().getUtility(IOpenstaxAccounts)
  
      def lookup_profile(username):
          profile = accounts.get_profile_by_username(username)
          # See structure documentation at:
          #   https://<accounts-instance>/api/docs/v1/users/index
          if profile is None:
              raise UserFetchError(username)
  
          opt_attrs = ('first_name', 'last_name', 'full_name',
                       'title', 'suffix',)
          for attr in opt_attrs:
              profile.setdefault(attr, None)
          return profile
  
      _upsert_users(cursor, user_ids, lookup_profile)
      _upsert_persons(cursor, user_ids, lookup_profile)
docs: Given a set of user identifiers (``user_ids``),
      upsert them into the database after checking accounts for
      the latest information.