diff --git a/muse-cloud/muse-module-content/muse-module-content-server/src/main/java/cn/iocoder/muse/module/content/dal/mysql/PlanningFieldSnapshotMapper.java b/muse-cloud/muse-module-content/muse-module-content-server/src/main/java/cn/iocoder/muse/module/content/dal/mysql/PlanningFieldSnapshotMapper.java
index bc62b704..346df2eb 100644
--- a/muse-cloud/muse-module-content/muse-module-content-server/src/main/java/cn/iocoder/muse/module/content/dal/mysql/PlanningFieldSnapshotMapper.java
+++ b/muse-cloud/muse-module-content/muse-module-content-server/src/main/java/cn/iocoder/muse/module/content/dal/mysql/PlanningFieldSnapshotMapper.java
@@ -3,7 +3,9 @@ package cn.iocoder.muse.module.content.dal.mysql;
 import cn.iocoder.muse.framework.mybatis.core.mapper.BaseMapperX;
 import cn.iocoder.muse.framework.mybatis.core.query.LambdaQueryWrapperX;
 import cn.iocoder.muse.module.content.dal.dataobject.PlanningFieldSnapshotDO;
+import org.apache.ibatis.annotations.Delete;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
 
 import java.util.List;
 
@@ -17,11 +19,16 @@ import java.util.List;
 @Mapper
 public interface PlanningFieldSnapshotMapper extends BaseMapperX<PlanningFieldSnapshotDO> {
 
-    /** 删除某 section 的旧快照（保存 planning 时先删后写，保证重复保存幂等）。 */
-    default int deleteBySectionId(Long sectionId) {
-        return delete(new LambdaQueryWrapperX<PlanningFieldSnapshotDO>()
-                .eq(PlanningFieldSnapshotDO::getSectionId, sectionId));
-    }
+    /**
+     * 物理删除某 section 的旧快照（保存 planning 时先删后写，保证重复保存幂等）。
+     *
+     * <p>WHY 物理删除而非 MyBatis-Plus 逻辑删除：本表是字段用量投影(可重建的派生数据、无审计价值),
+     * 唯一约束 uk(tenant_id, section_id, field_key) 不含 deleted 列。若走 @TableLogic 逻辑删除,
+     * 被删的物理行(deleted=TRUE)仍占用 uk,再次保存同字段时 INSERT 必撞唯一键→DuplicateKeyException(二次保存即 500)。
+     * 故用原生 DELETE 清干净物理行;tenant 插件会对该 DELETE 追加 tenant_id 条件,且 section_id 全局唯一,双重隔离。</p>
+     */
+    @Delete("DELETE FROM muse_content_planning_field_snapshot WHERE section_id = #{sectionId}")
+    int deleteBySectionId(@Param("sectionId") Long sectionId);
 
     /** 查某 section 现有快照（测试 / 校验用）。 */
     default List<PlanningFieldSnapshotDO> selectListBySectionId(Long sectionId) {