Rust + Diesel + Tokio.io + Postgres. I don't do web frontend (just apps and bots), and this stack took a LOT of time to get used to, but now I enjoy full static typing, perfect ORM-ish abstraction level (Diesel is kind of unique in that regard), built-in integration testing so it's compatible with SQL migrations and functions in Postgres and pretty good perfomance.
Could you elaborate on what you mean by built-in integration testing? I am using Rust now, full time, and can't wait for better testing support. There are RFCs to do just this. However, the current built-in testing situation leaves much for improvement.
https://github.com/diesel-rs/diesel/tree/master/diesel_tests
Now, every time I alter application code and/or SQL migrations, I immediately test them together automatically.