ToolsDB is a heavily loaded shared database. Combining many small users to a shared database makes some sense, but we should move some of its larger/heavier users to separate instances. Doing it via OpenStack Trove seems like the best solution.
Still to sort out: backups, replication?, how to enable self-provisioning of a new db by a Toolforge maintainer
ToolsDB databases ordered by size: https://tool-db-usage.toolforge.org/