功能迁移，页面整体样式修改

offline-backend-20260512/backend/packages/harness/deerflow/persistence/thread_meta/sql.py

@@ -174,6 +174,20 @@ class ThreadMetaRepository(ThreadMetaStore):
             await session.execute(update(ThreadMetaRow).where(ThreadMetaRow.thread_id == thread_id).values(status=status, updated_at=datetime.now(UTC)))
             await session.commit()
 
+    async def update_assistant_id(
+        self,
+        thread_id: str,
+        assistant_id: str,
+        *,
+        user_id: str | None | _AutoSentinel = AUTO,
+    ) -> None:
+        resolved_user_id = resolve_user_id(user_id, method_name="ThreadMetaRepository.update_assistant_id")
+        async with self._sf() as session:
+            if not await self._check_ownership(session, thread_id, resolved_user_id):
+                return
+            await session.execute(update(ThreadMetaRow).where(ThreadMetaRow.thread_id == thread_id).values(assistant_id=assistant_id, updated_at=datetime.now(UTC)))
+            await session.commit()
+
     async def update_metadata(
         self,
         thread_id: str,