delete assets that are older than 30 days

don't think you need the runnable here, 

    Akka.system.scheduler.schedule(new FiniteDuration(15,TimeUnit.MINUTES),new FiniteDuration(1,TimeUnit.DAYS), {
           AssetsDao.deleteAssetsOlderThan(Instant.now.toDateTime.minusDays(30))
     }


should do the trick?