diff --git a/src/blackboard/registry.py b/src/blackboard/registry.py
index af4f11c..057d3ca 100644
--- a/src/blackboard/registry.py
+++ b/src/blackboard/registry.py
@@ -171,17 +171,11 @@ class ProjectRegistry:
         )
 
     def delete_project(self, project_id: str) -> bool:
-        """删除项目（仅从注册表移除）"""
-        conn = self._connect()
-        try:
-            conn.execute("BEGIN IMMEDIATE")
-            cursor = conn.execute(
-                "DELETE FROM projects WHERE id=?", (project_id,)
-            )
-            conn.commit()
-            return cursor.rowcount > 0
-        finally:
-            conn.close()
+        """逻辑删除项目（status→deleted，不物理删除）"""
+        return self.update_project(
+            project_id,
+            status="deleted",
+        )
 
     # ===================================================================
     # 自动发现