Is there any way to suspend Neptune? I want to continue experimenting with it, but I'm facing hundreds of dollars per month while my instances are mostly idle. Ideally, I'd like to be able to wind down the cluster when I'm not using it, then boot back up later with the same endpoints and settings.
You can start/stop cluster from the console or CLI.
aws neptune stop-db-cluster --db-cluster-identifier mydbcluster
aws neptune start-db-cluster --db-cluster-identifier mydbcluster
See https://docs.aws.amazon.com/neptune/latest/userguide/manage-console-stop-start.html for details.