From 29289f5ba67d39255837a6385e5394192733a12e Mon Sep 17 00:00:00 2001
From: G30 <50341825+silentoplayz@users.noreply.github.com>
Date: Wed, 14 Oct 2026 10:30:31 -0400
Subject: [PATCH] fix: deleting a message in the middle of a chat keeps the
 earlier messages in the model's context (#32332)

---
 backend/open_webui/models/chats.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backend/open_webui/models/chats.py b/backend/open_webui/models/chats.py
index 464901d203..dbdae4eea1 100644
--- a/backend/open_webui/models/chats.py
+++ b/backend/open_webui/models/chats.py
@@ -1374,6 +1374,7 @@ class ChatTable:
                 self._repair_chat_current_id(chat)
 
                 history = chat.get('history', {})
+                parent_id = ((history.get('messages') or {}).get(message_id) or {}).get('parentId')
                 deleted_ids = self.delete_message_from_history(history, message_id)
                 await ChatMessages.delete_message_ids_by_chat_id(id, deleted_ids, db=session)
                 if not deleted_ids:
@@ -1384,6 +1385,12 @@ class ChatTable:
 
                     return ChatModel.model_validate(chat_item)
 
+                for mid, message in (history.get('messages') or {}).items():
+                    if message.get('parentId') == parent_id:
+                        await ChatMessages.upsert_message(
+                            mid, id, message.get('user_id') or chat_item.user_id, message, db=session
+                        )
+
                 chat['history'] = history
                 chat_item.chat = chat
                 chat_item.title = self._clean_null_bytes(chat.get('title', 'New Chat'))