add new deleters, update existing deleters
diff --git a/planetstack/observer/deleters/site_deployment_deleter.py b/planetstack/observer/deleters/site_deployment_deleter.py
new file mode 100644
index 0000000..fa97be2
--- /dev/null
+++ b/planetstack/observer/deleters/site_deployment_deleter.py
@@ -0,0 +1,12 @@
+from core.models import Site, SiteDeployments
+from observer.deleter import Deleter
+
+class SiteDeploymentDeleter(Deleter):
+    model='SiteDeployments'
+
+    def call(self, pk):
+        site_deployment = SiteDeployments.objects.get(pk=pk)
+        if site_deployment.tenant_id:
+            driver = self.driver.admin_driver(deployment=site_deployment.deployment.name)
+            driver.delete_tenant(site_deployment.tenant_id)
+        site_deployment.delete()