Currently Copr stores full yum_repos links in the database. I think that it would be better to store only some path and generate the links dynamically by prepending the path with configurable backend URL prefix, stored in config files and not in the database.

Current implementation makes it difficult to Copr installation to a different domain name without manually tweaking DB. It affects deployment at Fedora infra in two ways: 1. it makes setup of staging/dev instances more difficult and 2. it makes it more difficult to eventually move backend out of cloud as the redirects for the old location at copr-be.cloud.fedoraproject.org would need to be maintained forever.