--- a
+++ b/scripts/migrations/029-set-mailbox-queue_empty.py
@@ -0,0 +1,18 @@
+import logging
+
+from allura import model as M
+
+log = logging.getLogger(__name__)
+
+
+def main():
+    M.Mailbox.query.update({'queue': []},
+                           {'$set': {'queue_empty': True}},
+                           multi=True)
+
+    M.Mailbox.query.update({'queue': {'$ne': []}},
+                           {'$set': {'queue_empty': False}},
+                           multi=True)
+
+if __name__ == '__main__':
+    main()