When should I update the database?

I have some data kept in the session object that can be changed very
frequently by users during each session, so it's not efficient to update
database whenever a user makes a change. I want to update database just
before the session times out. I thought I could do database update in
valueUnbound of HttpSessionBindingListener. But at that moment, the data is
already gone. Could anybody suggest any solution?

Thanks.

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