ALTER TABLE `$table` CHANGE `id` `id` INT( 11 ) NOT NULL; 
ALTER TABLE `$table` DROP PRIMARY KEY ;
ALTER TABLE `$table` ADD `version_id` INT NOT NULL AUTO_INCREMENT ,
ADD `version_created` DATETIME NOT NULL ,
ADD PRIMARY KEY ( `version_id` ) ;
ALTER TABLE `$table` DROP PRIMARY KEY ,
ADD PRIMARY KEY ( `version_id` )