Hello.
I currently have 'cpg143_' as table prefix in the database.
Can I delete everything else except 'cpg143_' ?
I also have 'cpg_' in the database, but I think that is old and not in use.
All Coppermine tables use the same database prefix that is set in include/config.inc.php. Maybe some plugins have hardcoded table names, so we cannot say 'yes, you can delete everything else', as this may not apply for galleries which use certain plugins/mods.