Updates to delete missing subscriptions

app.py

@@ -150,11 +150,27 @@ class WebPushService():
                 vapid_private_key=vapid_key.private_key,
                 vapid_claims={"sub": CONTACT_EMAIL}
             )
+            time.sleep(1)
             return True
         
         except WebPushException as ex:
-            print(f"Failed to send push notification for {subscription_info['endpoint']} -- {ex}")
-            return False
+            now = datetime.datetime.now().isoformat()
+            endpoint = subscription_info['endpoint']
+            print(f"{now}: Failed to send push notification for {endpoint} -- {ex}")
+
+            unsubscribed_msg = '410 Gone'
+            if unsubscribed_msg in ex.args[0]:
+                subscription = Subscription.query.filter_by(endpoint=endpoint).first()
+
+                # Delete the subscription if found
+                if subscription:
+                    db.session.delete(subscription)
+                    db.session.commit()
+                    print(f"Committed delete of {subscription_info}")
+                else:
+                    print(f"Could not find subscription at: {endpoint}")
+            else:
+                print("Wrong error.", ex.args[0])
 
 
     def _send_daily_notifications(self) -> None: