session thread for cleanup (#67)

* session thread for cleanup

* Submodule update

* Submodule merge

Author: JWittmeyer

app.py

@@ -4,6 +4,7 @@
 from typing import List, Optional, Dict, Any, Union
 from neural_search import util
 from submodules.model.business_objects import general
+from submodules.model import session
 
 app = FastAPI()
 
@@ -246,3 +247,6 @@ def healthcheck() -> responses.PlainTextResponse:
     if not text:
         text = "OK"
     return responses.PlainTextResponse(text, status_code=status_code)
+
+
+session.start_session_cleanup_thread()