diff --git a/migrations/009_cleanup_duplicate_indexes.sql b/migrations/009_cleanup_duplicate_indexes.sql
new file mode 100644
index 0000000..de727a0
--- /dev/null
+++ b/migrations/009_cleanup_duplicate_indexes.sql
@@ -0,0 +1,6 @@
+-- 清理早期迁移重复创建的索引
+-- 这些索引在新数据库中已不会再被创建
+
+DROP INDEX IF EXISTS idx_posts_slug;
+DROP INDEX IF EXISTS idx_tags_name;
+DROP INDEX IF EXISTS idx_post_tags_tag_id;