Openfire cache maxtime impact

I need help & advice regarding the openfire cache maxtime. Currenlty whenever a new user visit my website,
I add them in Openfire DB via direct DB access instead of user service plugin. This new users is not getting
reflected immediately in webclient. Unless I do not restart the Openfire, this new users are not reflecting in webclient.
I am not in position to use user service plugin, because I have added one extra column in ofUser.
I am not sure how to handle this situation without restarting the openfire server.

I am not sure the impact & performance I will face but I have done below changes…

Openfire Cache I have set to 60000 ( 1 minute ) for all.

cache.username2roster.maxLifetime

cache.userGroup.maxLifetime

cache.userCache.maxLifetime

cache.group.maxLifetime

This has helped me to get the newuser reflect within span of one minite.

Please advice any adverse impact or Memory or concurrent users capacity