I have a PostgreSQL server  v. 8.3 installation. I have noticed that there are 
tables that begin with the prefix pga. The list of tables is as follow:

 pga_diagrams   pga_forms   pga_graphs   pga_images   pga_queries   pga_reports 
 
 pga_scripts  


I am wondering are those tables are part of postgres installation. if yes what 
are used for because all these tables are empty. if not, do you know what 
application might create/ use them

Regards

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