add "last updated" field to AK Slot

AKModel/migrations/0026_akslot_updated.py

+# Generated by Django 2.2.6 on 2019-10-31 00:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('AKModel', '0025_contact_email'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='akslot',
+            name='updated',
+            field=models.DateTimeField(auto_now=True, verbose_name='Last update'),
+        ),
+    ]

AKModel/models.py

@@ -24,7 +24,8 @@ class Event(models.Model):
                                        help_text='Default length in hours that is assumed for AKs in this event.')
 
     contact_email = models.EmailField(verbose_name=_("Contact email address"), blank=True,
-            help_text=_("An email address that is displayed on every page and can be used for all kinds of questions"))
+                                      help_text=_(
+                                          "An email address that is displayed on every page and can be used for all kinds of questions"))
 
     class Meta:
         verbose_name = _('Event')
@@ -263,6 +264,8 @@ class AKSlot(models.Model):
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
 
+    updated = models.DateTimeField(auto_now=True, verbose_name=_("Last update"))
+
     class Meta:
         verbose_name = _('AK Slot')
         verbose_name_plural = _('AK Slots')