I just tried to run vaultwarden (installed via pkg (no difference between latest or quarterly)) with mariadb as database. After adding
and restarting vaultwarden I get the following error in /var/log/messages
Aug 17 08:19:39 vault vaultwarden: Assertion failed: (param->buffer_length != 0), function setup_one_fetch_function, file /wrkdirs/usr/ports/databases/mysql57-client/work/mysql-5.7.35/libmysql/libmysql.c, line 4121.
looks quite similar to this issue bug #255748 even if I have mysql-5.7.35..