How do I see if the user has disconnected?

[Mark Antony]

I would like to run an sql update statement, every time the user disconnects a session.

Correct me if I'm wrong, but I believe I should capture that inside accounting { ... } where the final acctstoptime etc get stored into radacct table.

But I don't know how exactly to achieve this.
I suppose something like this below, but how do I know if the user actually disconnected?
accounting {
update request {
...
}
}

Thanks,
Mark

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