New inventory server/database

everything looks like it is configured/connected properly (in terms of
inventory and server policy objects), but logs at our leaf server sites
have the following line in them:

[4/7/05 13:45:00.920] ZENInv - Sender:
VOL1:\ZENWORKS\Inv\ScanDir\EntPushDir\111289590013 is
deleted as it is older than RollupInitTime

where is this mysterious RollupInitTime that is causing our ZIP files to
be deleted and therefore not roll up to our root server?

thanks in advance
Rachel Watts