Fix missing import

pokeranalytics_backend/settings.py

@@ -11,6 +11,7 @@ https://docs.djangoproject.com/en/4.1/ref/settings/
 """
 
 from pathlib import Path
+import os
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent