If the update did any changes to that db, you basically without a paddle to use it. If you go with lastnights backup, you have to use lastnights db or your asking for issues.
You could have a few days on the server if you set the config for the server to keep a couple of days, i only have my server set for two days i personally back up all the time on top of that so two days is not an issue for us.
lets hope and pray that you have both the files and the db from the same night saved or you will be doing a fresh install from scratch..
Dave is right, please restore your backup then follow the instructions from here: http://www.oxwall.org/forum/topic/24134
To do this:
1. go to ow_base_plugin table via phpmyadmin, locate messages plugin and put 0(zero) in the column isActive (this should make the message "Update plugin DB" go away)
2. then update the platform, but first do the steps indicated here: http://www.oxwall.org/forum/topic/24134
3. go to ow_base_plugin table via phpmyadmin, locate messages plugin and put 1back in the column isActive and try to update the plugin database again.