增强待办路由安全和查询索引

docs/sql/sys_todo_performance_index.sql

@@ -0,0 +1,20 @@
+-- 待办首页列表排序索引（用于已存在的 sys_todo_task 表）
+-- MySQL 5.7 兼容的幂等写法。
+
+SET @todoIndexExists := (
+  SELECT count(1)
+  FROM information_schema.statistics
+  WHERE table_schema = database()
+    AND table_name = 'sys_todo_task'
+    AND index_name = 'idx_todo_user_active_sort'
+);
+
+SET @todoIndexSql := IF(
+  @todoIndexExists = 0,
+  'ALTER TABLE sys_todo_task ADD INDEX idx_todo_user_active_sort (assignee_user_id, del_flag, task_status, priority, create_time, todo_id)',
+  'SELECT ''idx_todo_user_active_sort already exists'''
+);
+
+PREPARE todoIndexStatement FROM @todoIndexSql;
+EXECUTE todoIndexStatement;
+DEALLOCATE PREPARE todoIndexStatement;