Insert data into the state engine's history.
    It must be for a never-before-seen (txid,block_id,vtxindex) set.
    @history_id is either the name or namespace ID

    Return True on success
    Raise an Exception on error

def namedb_history_save( cur, opcode, history_id, creator_address, value_hash, block_id, vtxindex, txid, accepted_rec, history_snapshot=False ):
    """
    Insert data into the state engine's history.
    It must be for a never-before-seen (txid,block_id,vtxindex) set.
    @history_id is either the name or namespace ID

    Return True on success
    Raise an Exception on error
    """

    assert 'op' in accepted_rec, "Malformed record at ({},{}): missing op".format(block_id, accepted_rec['vtxindex'])
    
    op = accepted_rec['op']
   
    record_data = op_canonicalize(opcode, accepted_rec)
    record_txt = json.dumps(record_data, sort_keys=True)

    history_insert = {
        "txid": txid,
        "history_id": history_id,
        "creator_address": creator_address,
        "block_id": block_id,
        "vtxindex": vtxindex,
        "op": op,
        "opcode": opcode,
        "history_data": record_txt,
        'value_hash': value_hash
    }

    try:
        query, values = namedb_insert_prepare( cur, history_insert, "history" )
    except Exception, e:
        log.exception(e)
        log.error("FATAL: failed to append history record for '%s' at (%s, %s)" % (history_id, block_id, vtxindex))
        os.abort()

    namedb_query_execute( cur, query, values )
    return True