trigger ddl actions in a table

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I need a way for logging every action on the system catalog. I must have a
table which shows when a tables was created or updated or deleted. I need
the date  of the change .

I tried to make an trigger on pg_catalog.pg_class but this throws an error :
"ERROR: permission denied: "pg_class" is a system catalog".

I can see all ddl in my log files, but 
	- there are even the errors in and 
	- i can't use it for a select


Is there an possibility for having such an system-action table??



Thanks

Monika König






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