The ERD (Entity Relationship Diagram) for the Gratia database can be see in the formats listed below. It should be noted that it is not a "complete" picture of all the relationships. Many of the foreign key relationships were deliberately left off in order to simplify the diagram. The intent is to show the main parent/child relationships only.
The software used to maintain the ERD diagram is called DeZign for Databases Professional Version 4.2.0 from Datanamic Solutions BV (http://www.datanamic.com). The source file for the various versions is in the Gratia CVS repository in ./gratia/docs/erd :
OSG Installation Instructions
Intended for remote/local collectors that are installed from the OSG repository