`sign`.`signed_text`, `sign`.`signature`, `sign`.`signer`
FROM `item` USE INDEX (`uid_wall_changed`, `uid_type_changed`) $sql_post_table
STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
`sign`.`signed_text`, `sign`.`signature`, `sign`.`signer`
FROM `item` USE INDEX (`uid_wall_changed`, `uid_type_changed`) $sql_post_table
STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`