-- 為 evaluations 表添加新欄位
ALTER TABLE `evaluations` 
ADD COLUMN `performance_status` varchar(50) DEFAULT NULL COMMENT '表現狀況' AFTER `grade`,
ADD COLUMN `recommended_stars` int(11) DEFAULT NULL COMMENT '推薦等級(星星數量)' AFTER `performance_status`,
ADD COLUMN `excellent_items` int(11) DEFAULT NULL COMMENT '優秀項目數量' AFTER `recommended_stars`,
ADD COLUMN `improvement_items` int(11) DEFAULT NULL COMMENT '待改進項目數量' AFTER `excellent_items`;