You want to connect an existing magento 2 installation to a new database that is completely Clean.
one possible solution is this
Change this file: app/etc/env.php (in case you want to go back to the previous settings) -> for example, change it to app/etc/env.php--old.
Go to your magento webshop and the magento 2 setup wizard will restart. This is where you can specify your new database.
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