fix(auth):schedule refresh token cleanup

surfsense_backend/app/celery_app.py

@@ -188,6 +188,7 @@ celery_app = Celery(
         "app.tasks.celery_tasks.document_reindex_tasks",
         "app.tasks.celery_tasks.stale_notification_cleanup_task",
         "app.tasks.celery_tasks.stripe_reconciliation_task",
+        "app.tasks.celery_tasks.refresh_token_cleanup_task",
         "app.tasks.celery_tasks.auto_reload_task",
         "app.tasks.celery_tasks.gateway_tasks",
         "app.etl_pipeline.cache.eviction.task",
@@ -306,6 +307,11 @@ celery_app.conf.beat_schedule = {
         "schedule": crontab(hour="3", minute="17"),
         "options": {"expires": 600},
     },
+    "purge-refresh-tokens": {
+        "task": "purge_refresh_tokens",
+        "schedule": crontab(hour="3", minute="41"),
+        "options": {"expires": 600},
+    },
     # Prune the ETL parse cache (TTL + size budget) once daily, off-peak.
     "evict-etl-cache": {
         "task": "evict_etl_cache",

surfsense_backend/app/tasks/celery_tasks/refresh_token_cleanup_task.py

@@ -0,0 +1,34 @@
+"""Celery task for pruning expired refresh-token rows."""
+
+from __future__ import annotations
+
+import asyncio
+from datetime import UTC, datetime, timedelta
+
+from sqlalchemy import delete, or_
+
+from app.celery_app import celery_app
+from app.config import config
+from app.db import RefreshToken, async_session_maker
+
+
+@celery_app.task(name="purge_refresh_tokens")
+def purge_refresh_tokens() -> int:
+    return asyncio.run(_purge_refresh_tokens())
+
+
+async def _purge_refresh_tokens() -> int:
+    now = datetime.now(UTC)
+    revoked_cutoff = now - timedelta(seconds=config.REFRESH_ROTATION_GRACE_SECONDS)
+
+    async with async_session_maker() as session:
+        result = await session.execute(
+            delete(RefreshToken).where(
+                or_(
+                    RefreshToken.expires_at < now,
+                    RefreshToken.revoked_at < revoked_cutoff,
+                )
+            )
+        )
+        await session.commit()
+        return result.rowcount or 0