[ADMIN] pg_version_history

[Ezequiel Tolnay]

I found a table pg_version_history in the public schema (which we don't 
use). Does anyone know where this table comes from and what is it for?

Also I'd like to implement a code versioning for the functions. Is there 
a package or a software to do this kind of things, so we can recover 
from it a function in case it is deleted or overwritten with an old version?

Thanks
Ezequiel Tolnay
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