Add: setup clearing of expired tokens

backend/api/authentication/tasks.py

@@ -0,0 +1,12 @@
+from celery import shared_task
+from django.core.management import call_command
+
+
+@shared_task
+def flush_expired_tokens():
+    """Flush expired tokens using Django's call_command"""
+    try:
+        call_command("flushexpiredtokens")
+        return "Successfully flushed expired tokens"
+    except Exception as e:
+        return f"Error flushing tokens: {str(e)}"