SessionAppContext handling session timeout / deleting.

Good day,

I'm using SessionAppContext/SimpleSessionApp for server side  
sessions.  After a server
session times out and I receive a subsequent request from a client  
(which had a session)
as a result a SessionExpired exception is raised (quite correctly  
since it timed out) which
I guess I have to catch at app.run(Request()).

What is the right way to delete the old session and return a selected  
template page?
I notice your FAQ has an entry describing how to delete a session  
when I have a handle
to the context.  But in this case I don't have a handle to the  
context because
of where I am handling the exception and presumably because if it is  
expired it never got
instantiated for that request...

Feel free to point me to relevant documentation (I did look but  
nothing jumped out at
me that seemed appropriate) but I am new to Albatross and may have  
missed it.


Thanks

Tyler