Akka committableOffset store in DB - scala

Question

I am beginner in akka and I have an problem statement to work with. I have an akka flow that's reading Kafka Events from some topic and doing some transformation before creating Commitable offset of the message.
I am not sure the best way to add a akka sink on top of this code to store the transformed events in some DB
def eventTransform : Flow[KafkaMessage,CommittableRecord[Either[Throwable,SomeEvent]],NotUsed]
def processEvents
: Flow[KafkaMessage, ConsumerMessage.CommittableOffset, NotUsed] =
Flow[KafkaMessage]
.via(eventTransform)
.filter({ x =>
x.value match {
case Right(event: SomeEvent) =>
event.status != "running"
case Left(_) => false
}
})
.map(_.message.committableOffset)
This is my akka source calling the akka flow
private val consumerSettings: ConsumerSettings[String, String] = ConsumerSettings(
system,
new StringDeserializer,
new StringDeserializer,
)
.withGroupId(groupId)
.withProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest")
private val committerSettings: CommitterSettings = CommitterSettings(system)
private val control = new AtomicReference[Consumer.Control](Consumer.NoopControl)
private val restartableSource = RestartSource
.withBackoff(restartSettings) { () =>
Consumer
.committableSource(consumerSettings, Subscriptions.topics(topicIn))
.mapMaterializedValue(control.set)
.via(processEvents) // calling the flow here
}
restartableSource
.toMat(Committer.sink(committerSettings))(Keep.both)
.run()
def api(): Behavior[Message] =
Behaviors.receive[Message] { (_, message) =>
message match {
case Stop =>
context.pipeToSelf(control.get().shutdown())(_ => Stopped)
Behaviors.same
case Stopped =>
Behaviors.stopped
}
}
.receiveSignal {
case (_, _ #(PostStop | PreRestart)) =>
control.get().shutdown()
Behaviors.same
}
}