Thank you for using Bitnami. Odoo allows you select the database you want to use when log in to the application as well as creating and removing other databases. You can remove the the bitnami_odoo database as you already have a different database yo use.
If you want to be sure that you can recover the installation of Odoo easily if something wrong happens, you can create a full backup of the installation and recover that backup if something doesn't work as expected
Let us know if you have any questions.