I've installed mariadb and mariadb-clients and I want to install percona-server.
It fails because some files are already in the filesystem: the package "mariadb-clients" needs to be in conflict with percona-server, so it can be uninstalled automatically. Now I've fixed it manually (I've added "percona-server" in "conflicts" in /var/lib/pacman/local/mariadb-clients/desc ) and I was able to install percona-server.
Could you please open an issue at our github repo (https://github.com/artix-linux/world/issues)? It's easier and faster for the devs to respond.