diff --git a/src/langbot/pkg/persistence/migrations/dbm020_knowledge_engine_plugin_architecture.py b/src/langbot/pkg/persistence/migrations/dbm020_knowledge_engine_plugin_architecture.py
index a57df819..de10df9d 100644
--- a/src/langbot/pkg/persistence/migrations/dbm020_knowledge_engine_plugin_architecture.py
+++ b/src/langbot/pkg/persistence/migrations/dbm020_knowledge_engine_plugin_architecture.py
@@ -1,5 +1,3 @@
-import json
-
 import sqlalchemy
 from .. import migration
 
diff --git a/web/src/i18n/locales/zh-Hans.ts b/web/src/i18n/locales/zh-Hans.ts
index 9caee38a..77276385 100644
--- a/web/src/i18n/locales/zh-Hans.ts
+++ b/web/src/i18n/locales/zh-Hans.ts
@@ -749,7 +749,8 @@ const zhHans = {
         '共检测到 {{total}} 个知识库需要迁移（{{internal}} 个内置知识库，{{external}} 个外部知识库）。',
       startWithInstall: '自动安装插件并迁移',
       startDataOnly: '仅迁移数据',
-      dataOnlyHint: '「仅迁移数据」适合内网环境使用，请自行安装 LangRAG 插件后再迁移。',
+      dataOnlyHint:
+        '「仅迁移数据」适合内网环境使用，请自行安装 LangRAG 插件后再迁移。',
       dismiss: '丢弃原数据',
       running: '正在迁移知识库，请稍候...',
       success: '知识库迁移完成',