consider https://docs.percona.com/percona-server/8.0/limitations.html MyRocks engine instead of InnoDB for large tables. The main downside is no support for foreign keys, but this may be ok for the character_job table, at least, since no removals are done there. and if's efficient enough, then it may allow storage of all achievements as well, and generally of all "history of changes" kinds of tables, where no DELETEs are expected. This would make the tracker library less transferable, though.