Issue is not reproducible in Firefox 50.1.0
Clearing notifications
# sudo su - postgres $ psql nailgun nailgun=# delete from notifications ; DELETE 27365
is fix issue in Chrome
Issue is not reproducible in Firefox 50.1.0
Clearing notifications
# sudo su - postgres
$ psql nailgun
nailgun=# delete from notifications ;
DELETE 27365
is fix issue in Chrome