feat: add new sql.

电子日历/3.0.3.sql

-alter table t_ip2location_info
+alter table t_ip2location_info
@@ -9,3 +9,12 @@ create index idx_business_id
 
 alter table t_device
     add device_address_update_time datetime null comment '设备地址(country/province/city)上次更新时间' after city;
+
+
+-- 创建复合索引用于地理位置三级筛选
+ALTER TABLE t_device
+ADD INDEX idx_device_location(country, province, city);
+-- 单独按省份查询的需求
+ALTER TABLE t_device ADD INDEX idx_province(province);
+-- 单独按城市查询的需求
+ALTER TABLE t_device ADD INDEX idx_city(city);
\ No newline at end of file