provide logger object (mainly debugging)

app/main.py

@@ -12,6 +12,9 @@ from .database import SessionLocal, engine
 
 models.Base.metadata.create_all(bind=engine)
 
+import logging
+logger = logging.getLogger("uvicorn")
+
 app = FastAPI()
 
 origins = [
@@ -116,7 +119,7 @@ def start_cocal(background_tasks: BackgroundTasks, db: Session = Depends(get_db)
     cocal_session = crud.create_cocal_session(db, hash)
 
     # schedule cocal task
-    background_tasks.add_task(cocal_task, db, status, cocal_session)
+    background_tasks.add_task(cocal_task, db, hash)
 
     # report user
     return {