lichengkun135 if by "headers" you mean table names, then have you set table prefix? If yes, set it to null, FreeFlarum uses no prefix. Also make sure that your MariaDB version matches FreeFlarum's (10.8.3). Otherwise I don't know how to help, sorry. You should probably ask in discussion for the docker container, if it has any
Equinemarkt it looks like it was for a while, now it's back up. FreeFlarum automatically restarted all services because PHP-FPM stopped responding. I will have a look at the logs to see what caused this now