修复cookie失效后的一些问题

migrate_fix_signin_logs_fk.sql

@@ -0,0 +1,21 @@
+-- 修复 signin_logs 外键：删除账号时级联删除签到记录
+-- 用法: mysql -u weibo -p123456 weibo_hotsign < migrate_fix_signin_logs_fk.sql
+
+-- 先查出旧外键名并删除，再重建
+SET @fk_name = (
+    SELECT CONSTRAINT_NAME FROM information_schema.KEY_COLUMN_USAGE
+    WHERE TABLE_SCHEMA = 'weibo_hotsign'
+      AND TABLE_NAME = 'signin_logs'
+      AND COLUMN_NAME = 'account_id'
+      AND REFERENCED_TABLE_NAME = 'accounts'
+    LIMIT 1
+);
+
+SET @sql = CONCAT('ALTER TABLE signin_logs DROP FOREIGN KEY ', @fk_name);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+ALTER TABLE signin_logs
+    ADD CONSTRAINT fk_signin_logs_account
+    FOREIGN KEY (account_id) REFERENCES accounts(id) ON DELETE CASCADE;