Explicitly prevent deletion processing in steps in which it doesn't make
sense.
diff --git a/planetstack/ec2_observer/steps/sync_nodes.py b/planetstack/ec2_observer/steps/sync_nodes.py
index b66eb2e..9dc00f2 100644
--- a/planetstack/ec2_observer/steps/sync_nodes.py
+++ b/planetstack/ec2_observer/steps/sync_nodes.py
@@ -16,6 +16,9 @@
 	requested_interval=0
 
 	def fetch_pending(self, deletion):
+        if (deletion):
+            return []
+
 		deployment = Deployment.objects.filter(Q(name="Amazon EC2"))[0]
 		current_site_deployments = SiteDeployments.objects.filter(Q(deployment=deployment))