It looks like that the upstream Debian package (that is available on CQRLOG GitHub and Ubuntu PPA) already depends on mariadb since 2021:
https://github.com/ok2cqr/cqrlog/issues/291#issuecomment-770383265 https://github.com/ok2cqr/cqrlog/blob/master/debian/control#L12 Daniel OK2VLK
