Killing inactive connections

I run a clinical data warehouse using PostgreSQL
7.1.2_2 on FreeBSD 4.3-stable.  Data security and
privacy standards have been enacted at the federal
level via the Health Insurance Portability and
Accountability Act (HIPAA).

One of the rules requires timed logouts.  If someone
walks away from their desk for a certain amount of
time, the connection should time-out; and the employee
must log back into the application.

Data analysts access my databases using MS Access.  Is
there a way in PostgreSQL to track inactivity and
close inactive connections after a specified length of
time?

Thanks,

Andrew Gould

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