Zed’s DeltaDB is that very idea I believe

https://zed.dev/deltadb

is there some more information about DeltaDB? this seems to be an early access feature and not something available at the moment but I would be interested to learn more about it.

Edit: this was actually announced at a very recent blog post (11 july 2026 so just 11 days ago): https://zed.dev/blog/introducing-deltadb

The blogpost also has some more relevant information as well.