ALTER TABLE `vn`.`itemLog` 
CHANGE COLUMN `changedModel` `changedModel` ENUM('Item', 'ItemBarcode', 'ItemBotanical', 'ItemNiche', 'ItemTag', 'ItemTaxCountry') NOT NULL DEFAULT 'Item',
MODIFY COLUMN changedModelId INT(11) NOT NULL,
MODIFY COLUMN oldInstance JSON NULL,
MODIFY COLUMN newInstance JSON NULL,
DROP INDEX IF EXISTS `itemLog_changedModel_idx` ,
ADD INDEX IF NOT EXISTS `itemLog_changedModel_idx` (`changedModel` ASC, `changedModelId` ASC, `creationDate` ASC),
ADD INDEX IF NOT EXISTS `itemLog_originFk` (`originFk` ASC, `creationDate` ASC),
DROP INDEX IF EXISTS `itemLogItemFk_idx` ;