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I want to use ktor with postgresql. No dao frameworks - only raw statements because of dynamic data structure. 
Which driver is best for use  idiomatically with coroutines?

I found only mauricio/postgresql-async lib that works via futures / callback. Is it good for coroutines and ktor?

Yes, looks that this lib is async, so should work good with coroutines

<https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md#wrapping-callbacks>

there you can see how to wrap callbacks in corutines 