I have the same problem on the latest version of Revive Adserver, it bothers me.
I am on version 5.0.5 even though I am upgrading to a higher version.
the problem remains the same.
1 - I clean the addition, the prefix of the tables
2 - updating with new files
3 changing the database password and username
4 - changing the administrator password
5 - the configuration of nginx
when I request support for revive adserver. I only have one answer (please update revive adserver)