docs: def _GrantApproval(self, requestor_username, approval_id, grantor_username,
                       cursor):
      """Grants approval for a given request."""
      grant_args = {
          "username_hash": mysql_utils.Hash(requestor_username),
          "approval_id": approval_id,
          "grantor_username_hash": mysql_utils.Hash(grantor_username),
      }
      grant_query = (
          "INSERT INTO approval_grant {columns} VALUES {values}".format(
              columns=mysql_utils.Columns(grant_args),
              values=mysql_utils.NamedPlaceholders(grant_args)))
      cursor.execute(grant_query, grant_args)