Subscribe to session timeout

[berlicon]

Hi!
I need do some stuff when user logged out. I can do it via signals:
https://flask-login.readthedocs.io/en/latest/#flask_login.user_logged_out

@user_logged_out.connect
def mark_logout(sender, user, **extra):
print('LOGOUT')

#or so:
def mark_logout(sender, user, **extra):
print('LOGOUT')

user_logged_out.connect(mark_logout)

All works correctly. After user press button [Logout] I see in cmd where Superset back runned my log message.

But we hide button [Logout] in our webapp. So, I want when user leaves browser with Superset write that message to LOKI.

I can not wait when browser session expires (50min?). So I put that code to file \superset\config.py
PERMANENT_SESSION_LIFETIME = 10

And after 10sec session expires and I can see that browser redirects to login page.

But I can not see 'LOGOUT' in Superset cmd log. It seems when session expires, app does not get signal about logout.

How I can write some code when user logout when session expires?