Building a Cloud Database from Scratch: Why We Moved from C++ to Rust

"And our seven months of efforts went in vain."

I see this kind of comment all to often and I think author is being to hard on themselves and their team.

A well intentioned, well though out attempt that doesn't succeed is still very valuable if you learned from the experience. A key factor in success is a management team that lets engineers experiment, fail and refine future efforts.