Question about how an application should store "system"

[John McCawley <nospam@xxxxxxxxxxxx>]

I have decided that I'm going to resume working on my pgDesigner project 
( http://www.hardgeus.com/projects/pgdesigner/ ).  I haven't really 
maintained it for over a year, but I get about 200 visits a day to the 
project homepage, and about two or three emails a week asking for help.  
As the project currently stands, it stores datamodel information in a 
text file separate from the database.  What I would like to do is modify 
the application such that it can operate in "live" mode.  i.e. store all 
visual datamodel information in the database itself in a series of 
tables.  My question for this list is the following:  Is there a 
standard way for storing quasi-system related information in Postgres.  
i.e., this is essentially an admin tool, and I was wondering if there 
are naming conventions etc. I should follow such as the table names etc. 

John