many changes

atlas/tasks.py

@@ -173,6 +173,10 @@ def series_downsample_task(context, series_id, user_id, downsample_pct):
         series.source_series_instance_uid = source_series_uid
         series.series_instance_uid = replacement_series_uid
         series.save(update_fields=["modified", "source_series_instance_uid", "series_instance_uid"])
+        try:
+            series.get_total_image_size(refresh=True)
+        except Exception as exc:
+            logger.warning("Failed to refresh total_image_size for series {}: {}", series.pk, exc)
 
     cache.set(
         progress_key,