friendica/doc/database/db_challenge.md

Table challenge

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

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