proxies: handle origin destruction

app/mirror_sites.py

@@ -25,7 +25,7 @@ def mirror_sites():
                                               "url": a.url
                                           } for a in x.proxies if
                                           a.url is not None and not a.deprecated and not a.destroyed and a.provider == "cloudfront"
-                                      ]} for x in Origin.query.order_by(Origin.domain_name).all()
+                                      ]} for x in Origin.query.order_by(Origin.domain_name).all() if x.destroyed is None
         ]
     }
 

app/models.py

@@ -89,6 +89,11 @@ class Origin(AbstractConfiguration):
             "updated": self.updated
         }
 
+    def destroy(self):
+        super().destroy()
+        for proxy in self.proxies:
+            proxy.destroy()
+
     def __repr__(self):
         return '<Origin %r>' % self.domain_name