实现套餐生效条件覆盖与购买快照

migrations/000163_add_package_usage_terms_snapshots.down.sql

@@ -0,0 +1,9 @@
+-- 回滚套餐使用记录的购买计时条款快照字段。
+DROP TRIGGER IF EXISTS trg_validate_package_usage_terms_snapshot ON tb_package_usage;
+DROP FUNCTION IF EXISTS validate_package_usage_terms_snapshot();
+
+ALTER TABLE tb_package_usage
+    DROP COLUMN IF EXISTS duration_days_snapshot,
+    DROP COLUMN IF EXISTS duration_months_snapshot,
+    DROP COLUMN IF EXISTS calendar_type_snapshot,
+    DROP COLUMN IF EXISTS expiry_base_snapshot;