AKModel/migrations/0043_akslot_fixed_improve_verbose_name.py

+# Generated by Django 3.1.5 on 2021-01-29 15:43
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0042_akslot_fixed'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='akslot',
+            name='fixed',
+            field=models.BooleanField(default=False, help_text='Length and time of this AK should not be changed', verbose_name='Scheduling fixed'),
+        ),
+    ]

AKModel/migrations/0044_ak_history_remove_interest_counter.py

+# Generated by Django 3.1.5 on 2021-01-29 15:44
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0043_akslot_fixed_improve_verbose_name'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='historicalak',
+            name='interest_counter',
+        ),
+    ]

AKModel/models.py

@@ -233,7 +233,7 @@ class AK(models.Model):
     event = models.ForeignKey(to=Event, on_delete=models.CASCADE, verbose_name=_('Event'),
                               help_text=_('Associated event'))
 
-    history = HistoricalRecords()
+    history = HistoricalRecords(excluded_fields=['interest_counter'])
 
     class Meta:
         verbose_name = _('AK')
@@ -272,7 +272,9 @@ class AK(models.Model):
 
     def increment_interest(self):
         self.interest_counter += 1
+        self.skip_history_when_saving = True
         self.save()
+        del self.skip_history_when_saving
 
     @property
     def availabilities(self):