@classmethod
def add_trace_list(cls, current_session, trace_list, transaction_hash,
    transaction_index, block_number, timestamp):
    """
        Adds a list of traces in the sql session
        """
    for dict_trace in trace_list:
        trace = cls.add_trace(dict_trace, transaction_hash=transaction_hash,
            transaction_index=transaction_index, block_number=block_number,
            timestamp=timestamp)
    current_session.db_session.add(trace)
