Fix build failure and optimize imports

src/backend/langflow/api/v1/chat.py

@@ -178,7 +178,6 @@ async def stream_build(
                     time_elapsed = format_elapsed_time(time.perf_counter() - start_time)
                     update_build_status(cache_service, flow_id, BuildStatus.FAILURE)
 
-
                 vertex_id = vertex.parent_node_id if vertex.parent_is_top_level else vertex.id
                 if vertex_id in graph.top_level_vertices:
                     response = {

src/backend/langflow/services/cache/factory.py

@@ -1,7 +1,6 @@
 from typing import TYPE_CHECKING
 
-from langflow.services.cache.service import (BaseCacheService, InMemoryCache,
-                                             RedisCache)
+from langflow.services.cache.service import BaseCacheService, InMemoryCache, RedisCache
 from langflow.services.factory import ServiceFactory
 from langflow.utils.logger import logger
 

src/backend/langflow/services/database/service.py

@@ -148,9 +148,7 @@ class DatabaseService(Service):
         try:
             command.check(alembic_cfg)
         except Exception as exc:
-            if isinstance(
-                exc, (util.exc.CommandError, util.exc.AutogenerateDiffsDetected)
-            ):
+            if isinstance(exc, (util.exc.CommandError, util.exc.AutogenerateDiffsDetected)):
                 command.upgrade(alembic_cfg, "head")
                 time.sleep(3)