friendica/doc/database/db_sign.md

Table sign

Field	Description	Type	Null	Key	Default	Extra
id	sequential ID	int(10) unsigned	NO	PRI	NULL	auto_increment
iid	item.id	int(10) unsigned	NO	MUL	0
retract_iid		int(10) unsigned	NO	MUL	0
signed_text		mediumtext	NO		NULL
signature		text	NO		NULL
signer		varchar(255)	NO

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