diff --git a/sql/migrate-k109-legacy-drama-like-cleanup.sql b/sql/migrate-k109-legacy-drama-like-cleanup.sql
new file mode 100644
index 0000000..90c01fe
--- /dev/null
+++ b/sql/migrate-k109-legacy-drama-like-cleanup.sql
@@ -0,0 +1,23 @@
+-- Author: fruit.com.cn
+-- K109 清理历史遗留的「按整部剧点赞」数据。
+-- 产品口径：收藏按剧，点赞与评论按集。客户端点赞入口只作用于当前剧集
+-- （targetType = EPISODE），以下 DRAMA 记录均为 2026-10-21 15:49 之前的旧模型遗留。
+BEGIN;
+
+UPDATE content_like
+SET deleted = 1
+WHERE target_type = 'DRAMA' AND deleted = 0;
+
+-- 剧级点赞数由这些行累加而来，随软删一并按实际剩余行数校准，避免详情页展示虚高数字。
+UPDATE drama d
+SET like_count = sub.cnt
+FROM (
+    SELECT d2.id, COUNT(l.id) AS cnt
+    FROM drama d2
+    LEFT JOIN content_like l
+           ON l.target_type = 'DRAMA' AND l.target_id = d2.id AND l.deleted = 0
+    GROUP BY d2.id
+) sub
+WHERE d.id = sub.id AND d.like_count IS DISTINCT FROM sub.cnt;
+
+COMMIT;