9 | Field | Description | Type | Null | Key | Default | Extra |
10 | ----------- | ------------- | ------------ | ---- | --- | ------- | -------------- |
11 | id | sequential ID | int unsigned | NO | PRI | NULL | auto_increment |
12 | challenge | | varchar(255) | NO | | | |
13 | dfrn-id | | varchar(255) | NO | | | |
14 | expire | | int unsigned | NO | | 0 | |
15 | type | | varchar(255) | NO | | | |
16 | last_update | | varchar(255) | NO | | | |
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