wrap get_frame into transaction to avoid postgres error

pandora/item/management/commands/get_frame.py

@@ -2,6 +2,7 @@
 # vi:si:et:sw=4:sts=4:ts=4
 from django.core.management.base import BaseCommand
 from django.conf import settings
+from django.db import transaction
 
 settings.RELOAD_CONFIG = False
 import app.monkey_patch
@@ -14,6 +15,7 @@ class Command(BaseCommand):
     def handle(self, id, height, position, **options):
         position = float(position)
         height = int(height)
+        with transaction.commit_on_success():
             i = models.Item.objects.get(public_id=id)
             path = i.frame(position, height)
         if path: