The idea looks interesting. But when I think of "make incident recovery easy", the very last thing I want is a fork that differs from the standard that everyone else is running. I would have a better feeling if that would be an extension, not a fork.
It is PostgreSQL 18. One piece, read-dependency capture, has to be in the engine, and it ships as a small upstream-tracked patch. Extensions including pgvector, your ORM, and your SQL dialect all work unchanged.
https://pgbarman.org/