postgres su sessions every 5 mins - normal???

I just did a fresh install using Fedora 6. For some reason postgres is opening a su session every 5 minutes and then closing. It will open... wait 5 minutes... then close. Over and over again. I installed last night and came in this morning to see how things were going and see all the su sessions in my secure log file.

Is this normal? I have not done any adminstration setup so virtualmin and webmin are just as made them.

Closed (fixed)