diff --git a/HarborForge.Backend b/HarborForge.Backend
index f7f9ba3..b00c928 160000
--- a/HarborForge.Backend
+++ b/HarborForge.Backend
@@ -1 +1 @@
-Subproject commit f7f9ba3aa7a4b7fd67b6a347c372911ed58fed04
+Subproject commit b00c928148654cb06be3f6030095e1eb373e8f4b
diff --git a/plans/TASKLIST.md b/plans/TASKLIST.md
index 0980332..a6161b8 100644
--- a/plans/TASKLIST.md
+++ b/plans/TASKLIST.md
@@ -154,10 +154,10 @@
   - [x] 支持虚拟 slot 编辑并触发物化
   - [x] 返回编辑后的真实结果
 
-- [ ] BE-CAL-API-004:实现 Calendar 取消 API(backend only)
-  - [ ] 支持真实 slot cancel
-  - [ ] 支持虚拟 slot cancel 并触发物化
-  - [ ] 处理状态字段更新
+- [x] BE-CAL-API-004:实现 Calendar 取消 API(backend only)
+  - [x] 支持真实 slot cancel
+  - [x] 支持虚拟 slot cancel 并触发物化
+  - [x] 处理状态字段更新
 
 - [ ] BE-CAL-API-005:实现 plan-schedule / plan-list API(backend only)
   - [ ] 创建计划