You also need to update the roundcube config, phpmyadmin config, postfix config and proftp configs to use this new database also! There may be more, but those are the ones off the top of my head. ZPanel used a single user (root) for all services which is no longer the case in Sentora (More security).
Me.B might have some more information on this also.
Me.B might have some more information on this also.