fix celery once config

physical/celery.py

@@ -12,7 +12,15 @@ app = Celery('physical')
 # the configuration object to child processes.
 # - namespace='CELERY' means all celery-related configuration keys
 #   should have a `CELERY_` prefix.
-app.conf.ONCE.config_from_object('django.conf:settings', namespace='CELERY')
+app.config_from_object('django.conf:settings', namespace='CELERY')
+app.conf.ONCE = {
+  'backend': 'celery_once.backends.Redis',
+  'settings': {
+    'url': settings.CELERY_BROKER_URL,
+    'default_timeout': 60 * 60
+  }
+}
+
 
 # Load task modules from all registered Django app configs.
 app.autodiscover_tasks()