Add SQL operation and register it to be used as dependency for further
        sequential operations.

def add_sql_operation(self, app_label, sql_name, operation, dependencies):
        """
        Add SQL operation and register it to be used as dependency for further
        sequential operations.
        """
        deps = [(dp[0], SQL_BLOB, dp[1], self._sql_operations.get(dp)) for dp in dependencies]

        self.add_operation(app_label, operation, dependencies=deps)
        self._sql_operations[(app_label, sql_name)] = operation