diff --git a/backend/open_webui/models/channels.py b/backend/open_webui/models/channels.py
index 95cc58cd32..215b46ead6 100644
--- a/backend/open_webui/models/channels.py
+++ b/backend/open_webui/models/channels.py
@@ -1,4 +1,3 @@
-import json
 import secrets
 import time
 import uuid
diff --git a/backend/open_webui/models/chat_messages.py b/backend/open_webui/models/chat_messages.py
index 8215cb69db..56c78d9b5b 100644
--- a/backend/open_webui/models/chat_messages.py
+++ b/backend/open_webui/models/chat_messages.py
@@ -1,4 +1,3 @@
-import json
 import time
 import uuid
 from collections import Counter
diff --git a/backend/open_webui/models/groups.py b/backend/open_webui/models/groups.py
index 66785794a7..8f402f0b12 100644
--- a/backend/open_webui/models/groups.py
+++ b/backend/open_webui/models/groups.py
@@ -1,4 +1,3 @@
-import json
 import logging
 import time
 import uuid
diff --git a/backend/open_webui/models/knowledge.py b/backend/open_webui/models/knowledge.py
index 52a78c46c1..b3a231a4a7 100644
--- a/backend/open_webui/models/knowledge.py
+++ b/backend/open_webui/models/knowledge.py
@@ -1,4 +1,3 @@
-import json
 import logging
 import time
 import uuid
diff --git a/backend/open_webui/models/messages.py b/backend/open_webui/models/messages.py
index dc43dfe1e9..82ac3336dd 100644
--- a/backend/open_webui/models/messages.py
+++ b/backend/open_webui/models/messages.py
@@ -1,4 +1,3 @@
-import json
 import time
 import uuid
 from typing import Optional
diff --git a/backend/open_webui/models/notes.py b/backend/open_webui/models/notes.py
index 8d8eb2414f..c651c6f51e 100644
--- a/backend/open_webui/models/notes.py
+++ b/backend/open_webui/models/notes.py
@@ -1,4 +1,3 @@
-import json
 import time
 import uuid
 from functools import lru_cache
diff --git a/backend/open_webui/models/prompt_history.py b/backend/open_webui/models/prompt_history.py
index 947d33a133..074bb5d039 100644
--- a/backend/open_webui/models/prompt_history.py
+++ b/backend/open_webui/models/prompt_history.py
@@ -1,7 +1,6 @@
 """Prompt history model for version tracking."""
 
 import difflib
-import json
 import time
 import uuid
 from typing import Optional
diff --git a/backend/open_webui/retrieval/vector/dbs/opengauss.py b/backend/open_webui/retrieval/vector/dbs/opengauss.py
index 1c9d35253c..142eb8546c 100644
--- a/backend/open_webui/retrieval/vector/dbs/opengauss.py
+++ b/backend/open_webui/retrieval/vector/dbs/opengauss.py
@@ -2,7 +2,6 @@
 NOTE: This vector database integration is community-supported and maintained on a best-effort basis.
 """
 
-import json
 import logging
 import re
 from typing import Any, Dict, List, Optional
diff --git a/backend/open_webui/routers/channels.py b/backend/open_webui/routers/channels.py
index f0b706df1d..225c505532 100644
--- a/backend/open_webui/routers/channels.py
+++ b/backend/open_webui/routers/channels.py
@@ -1,6 +1,5 @@
 import base64
 import io
-import json
 import logging
 from typing import Optional
 
diff --git a/backend/open_webui/routers/chats.py b/backend/open_webui/routers/chats.py
index e618eb3f06..28ee2fef6f 100644
--- a/backend/open_webui/routers/chats.py
+++ b/backend/open_webui/routers/chats.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import asyncio
-import json
 import logging
 from typing import Optional
 from uuid import uuid4
diff --git a/backend/open_webui/routers/models.py b/backend/open_webui/routers/models.py
index 8bc9ee74b1..808b5b431e 100644
--- a/backend/open_webui/routers/models.py
+++ b/backend/open_webui/routers/models.py
@@ -3,7 +3,6 @@ from __future__ import annotations
 import asyncio
 import base64
 import io
-import json
 import logging
 import posixpath
 from typing import Optional
diff --git a/backend/open_webui/routers/notes.py b/backend/open_webui/routers/notes.py
index ceb47708f5..3f598c69c4 100644
--- a/backend/open_webui/routers/notes.py
+++ b/backend/open_webui/routers/notes.py
@@ -1,4 +1,3 @@
-import json
 import logging
 from typing import Optional
 from uuid import uuid4
diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 4bb2fbca88..eda832cca0 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import asyncio
-import json
 import logging
 import mimetypes
 import os
diff --git a/backend/open_webui/tools/knowledge_fs.py b/backend/open_webui/tools/knowledge_fs.py
index eed252ff2b..e7b2e7ee51 100644
--- a/backend/open_webui/tools/knowledge_fs.py
+++ b/backend/open_webui/tools/knowledge_fs.py
@@ -8,7 +8,6 @@ Re-exported through builtin.py for consistent imports.
 """
 
 import contextvars
-import json
 import logging
 import re
 import shlex