-- 订阅套餐按 applicationId / 包名区分定价；空字符串 = 默认兜底。
-- 原 PRIMARY KEY (plan_id, lang) → (plan_id, lang, package_name)

ALTER TABLE t_subscription_plans
    ADD COLUMN package_name VARCHAR(256) NOT NULL DEFAULT '' COMMENT 'applicationId/包名，空=默认兜底' AFTER lang;

ALTER TABLE t_subscription_plans
    DROP PRIMARY KEY,
    ADD PRIMARY KEY (plan_id, lang, package_name);

ALTER TABLE t_subscription_plans
    ADD KEY idx_sub_plans_pkg (package_name, enabled, sort_order);