sig reference - Snorby/snorby GitHub Wiki
+---------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------+---------+------+-----+---------+-------+ | sig_id | int(11) | NO | PRI | NULL | | | ref_seq | int(11) | NO | PRI | NULL | | | ref_id | int(11) | YES | | NULL | | +---------+---------+------+-----+---------+-------+