5 | Field | Description | Type | Null | Key | Default | Extra |
6 | ----- | ----------- | ---- | ---- | --- | ------- | ----- |
7 | id | sequential ID | int unsigned | YES | PRI | NULL | auto_increment |
8 | challenge | | varchar(255) | YES | | | |
9 | dfrn-id | | varchar(255) | YES | | | |
10 | expire | | int unsigned | YES | | 0 | |
11 | type | | varchar(255) | YES | | | |
12 | last_update | | varchar(255) | YES | | | |
14 Return to [database documentation](help/database)