Advice on logging strategy

I have loggin set to

log_statement = 'all' on a network database with logging set to csv so I can import it to a logging table

However the database is populated via a nightly routine downloading data via REST APIusing prepared statements

This results in enormous log files which take ages to import using copy becuase each execute statement is logged with the parameters chosen

Is there any way around this?

I cant find any way to filter dml statements

thanks