in main.py [0:0]
def __init__(self, app, session_dir: str = "sessions", cookie_name: str = "session_id", max_age: int = 86400):
super().__init__(app)
self.session_dir = session_dir
self.cookie_name = cookie_name
self.max_age = max_age
os.makedirs(session_dir, exist_ok=True)