Update the cookie to secure on LIVE

Set the expiration of the cookie.

app/its_dangerous_session.py

@@ -1,3 +1,5 @@
+from datetime import timedelta, datetime
+
 from werkzeug.datastructures import CallbackDict
 from flask.sessions import SessionInterface, SessionMixin
 from itsdangerous import URLSafeTimedSerializer, BadSignature
@@ -43,7 +45,8 @@ class ItsdangerousSessionInterface(SessionInterface):
                 response.delete_cookie(app.session_cookie_name,
                                        domain=domain)
             return
-        expires = self.get_expiration_time(app, session)
+        session.permanent=True
+        expires=  datetime.utcnow() + timedelta(app.config.get('PERMANENT_SESSION_LIFETIME'))
         val = self.get_serializer(app).dumps(dict(session))
         response.set_cookie(app.session_cookie_name, val,
                             expires=expires, httponly=True,