[samsquire]

Upgrading software and Postgres databases is a difficult problem in general.

The text itself can be changed but it takes at least 15 minutes to mutate to a deployment. We still cannot generically mutate running code to other running code. Ksplice and other live kernel patching and Chrome's binary patching should be generalised and productised.

Patching methods at runtime is another thing that is possible (ruby, python and Erlang) but I am not aware of a general framework for deploying mutations to servers at runtime.