Admin improvements (#11)

* Add the group column to OrmQ admin page

* Add group field to tasks list and search_field

* Add search by name to Schedule admin page

* Limit succesful task history per schedule with SAVE_LIMIT_GROUP config

* Improve ScheduleAdmin list view performance

Co-authored-by: Marc Sabatier <marc@sabatier.online>

django_q/models.py

@@ -220,7 +220,10 @@ class Schedule(models.Model):
         return self.func
 
     success.boolean = True
+    success.short_description = _("success")
     last_run.allow_tags = True
+    last_run.short_description = _("last_run")
+
 
     class Meta:
         app_label = "django_q"
@@ -246,6 +249,9 @@ class OrmQ(models.Model):
     def name(self):
         return self.task()["name"]
 
+    def group(self):
+        return self.task().get("group")
+
     class Meta:
         app_label = "django_q"
         verbose_name = _("Queued task")