I have talk about that with several people at Kotlinconf, but Pivotal has announced 2 weeks ago R2DBC which is an initiative to provide Reactive SQL drivers, with a PostgreSQL driver already available, and others likely to be later. I am working on Spring side to provide Coroutines API on top of that but https://github.com/r2dbc/r2dbc-client is only based on Reactor and could be easily exposed with a Coroutines API using https://github.com/Kotlin/kotlinx.coroutines/tree/master/reactive/kotlinx-coroutines-reactor for other Kotlin server side ecosystems. With https://github.com/Kotlin/kotlinx.coroutines/issues/284 it will even be possible to manage async transactions, and with https://github.com/Kotlin/kotlinx.coroutines/issues/254 you will be able to receive rows as streams.

Great! It is really hot! I'll wait for this awesome features in production!