<How to add kotlin coroutines to Spring graphql al...

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How to add kotlin coroutines to Spring graphql all the way to the DB?
I have a spring-boot project with usage of spring-graphql. Simple controller example below.
In it there's an invocation of CrudRepository, etc.
How do I integrate Kotlin coroutines all the way to the DB?
Thanks.
import org.springframework.graphql.data.method.annotation.Argument
import org.springframework.graphql.data.method.annotation.MutationMapping
import org.springframework.graphql.data.method.annotation.QueryMapping
import org.springframework.stereotype.Controller

@Controller
class...