[squid-users] Can 'credtentialsttl' in basic auth scheme be simulated in digest auth?

We have many users with WLAN access to Squid - so basic authentication cannot
be used for security reasons.
In basic authentication Squid can be forced to query the helper for the
credentials by setting the 'credentialsttl' parameter to a few seconds - so
when you remove the user-credentials from the database the user can't access
Squid anymore.
I wanted the same behaviour with the digest auth scheme and tried

auth_param digest nonce_garbage_interval 3 seconds
auth_param digest nonce_max_duration 3 seconds

But if I remove the user from the database which is queried by the helper -
there is no effect.
The credentials that the browser is sending are still valid - so the user
has further access to the internet.

Do anybody have a digest auth scheme that is working this way?
Hints would be appreciated. Thanx

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