CREATE TABLE `product_stock` (
  `product_id` int(11) unsigned NOT NULL,
  `stock_level` int(11) NOT NULL DEFAULT '0',
  `minimum_cart_quantity` int(11) unsigned NOT NULL,
  `maximum_cart_quantity` int(11) unsigned NOT NULL DEFAULT '0',
  `minimum_stock_level` int(11) NOT NULL DEFAULT '0',
  `alert_level_reached_at` datetime DEFAULT NULL,
  `alert_level` int(11) DEFAULT NULL,
  PRIMARY KEY (`product_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;