ScheduleSourceImport: only flag items as 'seen', not 'changed'

src/core/models/schedules.py

@@ -254,7 +254,7 @@ class ScheduleSource(models.Model):
 
         items[item_source_id] = mapping.local_object
         activity.append({
-            'action': 'changed',  # TODO: actually check if data was changed
+            'action': 'seen',  # TODO: set to 'changed' if data was changed (returned by .from_dict()?)
             'type': item_type,
             'source_id': item_source_id,
             'local_id': str(mapping.local_id),