QueueConfig
class QueueConfig(val name: QueueName, val concurrency: Int = 8, val dispatcher: CoroutineDispatcher? = null)
Per-queue execution settings. Concurrency is a coroutine count, not a thread count: an I/O-bound queue can comfortably run hundreds. dispatcher overrides where handlers run; set it (for example to a bounded IO dispatcher) when handlers block, such as JDBC.