[simonask]

You can extend diesel in theory, but can you really in practice? In my experience, it's very hard to work with once you get into the weeds. It's a big mess of very complicated generic signatures.

Might have improved since last I checked, but I was pretty confused.

[fiedzia]

I've added some sql functions, and support for decimal type for mysql (It didn't have it at some point). Wasn't complicated.