Add various deleted flags to entities | Add active to subscriptions | Add DeleteUser && DeleteChannel endpoints [skip-tests]

scnserver/push/testSink.go

@@ -39,3 +39,7 @@ func (d *TestSink) SendNotification(ctx context.Context, user models.User, clien
 
 	return key, "", nil
 }
+
+func (d *TestSink) Clear() {
+	d.Data = make([]SinkData, 0)
+}