cron jobs should be killed if hang

Each cron job has a "wall time" of 15 minutes. The reason behind is that sometimes it might happen that the cron job hang (in a real time scenario it was RedCap connector that hung, because of some strange network issues). In such situation the job has open DB session that prevents some operations on DB (like applying migration scripts in our real case scenario).

Closes #200 (closed)

smash/web/forms/voucher_forms.py

@@ -8,7 +8,7 @@ from django.utils import timezone
 from web.algorithm import VerhoeffAlgorithm
 from web.forms.forms import DATEPICKER_DATE_ATTRS
 from web.models import VoucherType, VoucherTypePrice, Voucher, Worker
-from web.models.constants import VOUCHER_STATUS_NEW, VOUCHER_STATUS_USED, VOUCHER_STATUS_EXPIRED
+from web.models.constants import VOUCHER_STATUS_USED, VOUCHER_STATUS_EXPIRED
 from web.models.worker_study_role import WORKER_VOUCHER_PARTNER
 
 logger = logging.getLogger(__name__)
@@ -58,7 +58,7 @@ class VoucherForm(ModelForm):
             self.fields['hours'].widget.attrs['readonly'] = True
             self.fields['usage_partner'].widget.attrs['readonly'] = True
 
-            if instance.status == VOUCHER_STATUS_USED or instance.status == VOUCHER_STATUS_EXPIRED:
+            if instance.status in [VOUCHER_STATUS_USED, VOUCHER_STATUS_EXPIRED]:
                 self.fields['status'].widget.attrs['readonly'] = True
                 self.fields['feedback'].widget.attrs['readonly'] = True