Probably because it's an open source project and apparently none of its users cared about this feature enough to develop it or fund it.
Probably because it's an open source project and apparently none of its users cared about this feature enough to develop it or fund it.
It is also a bit tricky tradeoff. You do not want to be stuck with the same data format forever. So databases like MySQL and PostgreSQL need a downtime when doing a major version upgrade. They both try to keep it short, usually seconds, but minutes can happen in either database.