docs(sql): 完成 #19 过期模块数据库脚本与校验

docs/sql/expiry.sql

@@ -16,10 +16,13 @@ CREATE TABLE IF NOT EXISTS expiry_items (
   quantity INT DEFAULT 1 COMMENT '数量',
   location VARCHAR(50) DEFAULT NULL COMMENT '存放位置（可选）',
   remark VARCHAR(255) DEFAULT NULL COMMENT '备注（可选）',
-  status VARCHAR(20) DEFAULT 'normal' COMMENT '状态：normal/used/expired/discarded',
+  status VARCHAR(20) DEFAULT 'normal' COMMENT '状态：normal/used/discarded（expiring/expired 由业务动态计算）',
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
   updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
   deleted_at TIMESTAMP NULL DEFAULT NULL COMMENT '软删除时间',
+  CONSTRAINT chk_expiry_category CHECK (category IN ('food', 'medicine', 'cosmetic', 'other')),
+  CONSTRAINT chk_expiry_quantity CHECK (quantity > 0),
+  CONSTRAINT chk_expiry_status CHECK (status IN ('normal', 'used', 'discarded')),
   
   -- 索引
   INDEX idx_user_expiry (user_id, expiry_date) COMMENT '用户+过期日期索引（最常用查询）',
@@ -34,7 +37,7 @@ CREATE TABLE IF NOT EXISTS expiry_items (
 CREATE TABLE IF NOT EXISTS expiry_user_settings (
   id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY COMMENT '主键ID',
   user_id BIGINT UNSIGNED NOT NULL UNIQUE COMMENT '用户ID（唯一）',
-  remind_days JSON DEFAULT '[7,3,1]' COMMENT '提醒天数数组，例如 [7,3,1]',
+  remind_days JSON DEFAULT (JSON_ARRAY(7,3,1)) COMMENT '提醒天数数组，例如 [7,3,1]',
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
   updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',