ref: Some ruff fixes from preview (#5420)

* Some ruff fixes from preview

* [autofix.ci] apply automated fixes

* [autofix.ci] apply automated fixes (attempt 2/3)

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/conftest.py

@@ -17,8 +17,10 @@ from blockbuster import blockbuster_ctx
 from dotenv import load_dotenv
 from fastapi.testclient import TestClient
 from httpx import ASGITransport, AsyncClient
+from langflow.components.inputs import ChatInput
 from langflow.graph import Graph
 from langflow.initial_setup.constants import STARTER_FOLDER_NAME
+from langflow.main import create_app
 from langflow.services.auth.utils import get_password_hash
 from langflow.services.database.models.api_key.model import ApiKey
 from langflow.services.database.models.flow.model import Flow, FlowCreate
@@ -155,8 +157,6 @@ def caplog(caplog: pytest.LogCaptureFixture):
 
 @pytest.fixture
 async def async_client() -> AsyncGenerator:
-    from langflow.main import create_app
-
     app = create_app()
     async with AsyncClient(app=app, base_url="http://testserver", http2=True) as client:
         yield client
@@ -228,8 +228,6 @@ def distributed_client_fixture(
         # def get_session_override():
         #     return session
 
-        from langflow.main import create_app
-
         app = create_app()
 
         # app.dependency_overrides[get_session] = get_session_override
@@ -357,8 +355,6 @@ async def client_fixture(
                 monkeypatch.setenv("LANGFLOW_LOAD_FLOWS_PATH", load_flows_dir)
                 monkeypatch.setenv("LANGFLOW_AUTO_LOGIN", "true")
 
-            from langflow.main import create_app
-
             app = create_app()
             db_service = get_db_service()
             db_service.database_url = f"sqlite:///{db_path}"
@@ -482,8 +478,6 @@ async def flow(
     json_flow: str,
     active_user,
 ):
-    from langflow.services.database.models.flow.model import FlowCreate
-
     loaded_json = json.loads(json_flow)
     flow_data = FlowCreate(name="test_flow", data=loaded_json.get("data"), user_id=active_user.id)
 
@@ -577,8 +571,6 @@ async def added_webhook_test(client, json_webhook_test, logged_in_headers):
 
 @pytest.fixture
 async def flow_component(client: AsyncClient, logged_in_headers):
-    from langflow.components.inputs import ChatInput
-
     chat_input = ChatInput()
     graph = Graph(start=chat_input, end=chat_input)
     graph_dict = graph.dump(name="Chat Input Component")