Local system user accounts deleted after Mavericks update
Just a note to anyone that might have seen this after upgrading to OSX Server 3 and Mavericks...
I had JIRA and Confluence running on my Mac Mini (10.8). They were running as daemon processes under local system accounts that I created using the dscl utility. After the upgrade neither applications would start. It appeared that both system accounts no longer existed. Oddly, the group to which they both belonged was not removed. I was able to re-create the accounts with dscl and got both applications up and running again.
So if you find any daemons no longer run after the upgrade, check to see if the accounts they are set to run as still exist!
Mac mini, OS X Server, Mavericks 10.9