4 | Field | Description | Type | Null | Key | Default | Extra |
5 |-------------|------------------|------------------|------|-----|---------|----------------|
6 | id | sequential ID | int(10) unsigned | NO | PRI | NULL | auto_increment |
7 | challenge | | varchar(255) | NO | | | |
8 | dfrn-id | | varchar(255) | NO | | | |
9 | expire | | int(11) | NO | | 0 | |
10 | type | | varchar(255) | NO | | | |
11 | last_update | | varchar(255) | NO | | | |
13 Return to [database documentation](help/database)