ALTER TABLE `mm_SponsorCategory` ADD `limit` INT NULL DEFAULT NULL AFTER `description`;
ALTER TABLE `mm_SponsorCategory` CHANGE `limit` `limit` INT(11) UNSIGNED NULL DEFAULT NULL;
ALTER TABLE `mm_SponsorshipSubmission` ADD `categoryId` INT UNSIGNED NULL DEFAULT NULL AFTER `categoryTitle`, ADD INDEX (`categoryId`) ;
ALTER TABLE `mm_SponsorshipSubmission` ADD FOREIGN KEY (`categoryId`) REFERENCES `mm_SponsorCategory`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;

UPDATE mm_SponsorshipSubmission as `ss`
JOIN mm_CartItem as `ci` ON
  `ci`.`cartItemType` = 'Sponsor\\Category\\CartItem'
  AND `ci`.`productId` = `ss`.`id`
SET `ss`.`categoryId` = `ci`.`productCategoryId`
WHERE `ss`.`categoryId` IS NULL;