Improve taskresults app

- show created/modified fields in admin
- add verbose output to management command
- add date hierarchy and action filters in admin

gnuviechadmin/taskresults/models.py

@@ -3,6 +3,7 @@ This model defines the database models to handle Celery AsyncResults.
 
 """
 from django.db import models
+from django.utils import timezone
 from django.utils.translation import gettext as _
 from model_utils.models import TimeStampedModel
 
@@ -33,7 +34,7 @@ class TaskResult(TimeStampedModel):
     class Meta:
         verbose_name = _("Task result")
         verbose_name_plural = _("Task results")
-        ordering = ["created"]
+        ordering = ["-modified"]
 
     def __str__(self):
         return "{creator} ({task_id}): {finished}".format(