[Onavo]

Have you seen https://news.ycombinator.com/item?id=42174204

[mbrt]

I just saw it! I asked a question (https://news.ycombinator.com/item?id=42180611) and it seems that durability and consistency are implemented at the caching layer.

Basically an in-memory database which uses S3 as cold storage. Definitely an interesting approach, but no transactions AFAICT.