MySQL, MariaDB and PostgreSQL for economies, player stats and bot data, set up so a wipe doesn't lose it.
Built around what the data needs to do. An economy and a stat tracker need very different setups, and treating them the same is how databases get slow and fragile.
Backups, replication where it matters, and a setup where a bad query or a server wipe doesn't take your data with it.
Moving off a messy database into something organized, without losing your history.
Tell us what you're running and we'll let you know what it takes.