[OAuth] Add task to clear expired tokens

CHANGELOG.rst

@@ -9,6 +9,11 @@ and this project adheres to `Semantic Versioning`_.
 Unreleased
 ----------
 
+Added
+~~~~~
+
+* [OAuth] Expired tokens are now cleared in a periodic task
+
 Fixed
 ~~~~~
 

aleksis/core/tasks.py

@@ -40,3 +40,11 @@ def backup_data() -> None:
     # Hand off to dbbackup's management commands
     management.call_command("dbbackup", *db_options)
     management.call_command("mediabackup", *media_options)
+
+
+@app.task(run_every=timedelta(days=1))
+def clear_oauth_tokens():
+    """Clear expired OAuth2 tokens."""
+    from oauth2_provider.models import clear_tokens  # noqa
+
+    return clear_tokens()