You don't want to modify the LDCLIENT.DB at all, ideally .
So the "trick" to this is simple - check "/opt/landesk/jobs/" - you will see an "ldiscan_daily.xml" in it. The MAP-SCHEDULER checks the JOBS directory for "do I have anything to do" type stuff, and the TIMESTAMP flag in the XML is in CTIME (you can find a converter easily enough - the first hit on google for me was this - http://morecavalier.com/index.php?whom=Apps%2FUnix+timestamp+converter ).
Alternatively, you can delete the daily scan from the jobs directory and simply add an inventory scan command line to your CRON.DAILY or so (which would then result in a "one-off" XML-file in the jobs directory for a short thing).
That should help you out here .
- Paul Hoffmann