diff --git a/TODO b/TODO
index 3ec440f..11c829d 100644
--- a/TODO
+++ b/TODO
@@ -20,10 +20,8 @@ other known problems:
 
 - we should add dates to the outputs, to make it more useful in logfiles
 
-known problems in production:
+- maybe change logo in browser dark mode to https://upload.wikimedia.org/wikipedia/commons/2/2a/Wmde_logo_vert_weiss.png
 
-- works only with django == 3.1.x
-
-- reboot of container should be far more automated
-
-- puppet should provide the git source, and secrets.json and settings.py link
+- warning from django 3.2:
+input.BusinessCard: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
+	HINT: Configure the DEFAULT_AUTO_FIELD setting or the InputConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.
diff --git a/input/forms.py b/input/forms.py
index 5dc5c3d..4994207 100644
--- a/input/forms.py
+++ b/input/forms.py
@@ -3,7 +3,7 @@ from django.forms import ModelForm, DateField, ChoiceField, RadioSelect, Boolean
 from django.contrib.admin.widgets import AdminDateWidget
 from django.utils.html import format_html
 
-from .models import Project, Volunteer, Extern, IFG, Library, TYPE_CHOICES,\
+from .models import Project, Volunteer, Extern, ConcreteExtern, IFG, Library, TYPE_CHOICES,\
                     HonoraryCertificate, Travel, Email, Literature, List,\
                     BusinessCard
 from .settings import DATAPROTECTION, FOERDERRICHTLINIEN, NUTZUNGSBEDINGUNGEN
@@ -36,7 +36,7 @@ class ExternForm(FdbForm):
                          DATAPROTECTION, FOERDERRICHTLINIEN))
 
     class Meta:
-        model = Extern
+        model = ConcreteExtern
         exclude = ('granted', 'granted_date', 'survey_mail_send', 'service_id', 'survey_mail_date')
 
 INTERN_CHOICES = {'PRO': 'Projektsteckbrief',
diff --git a/input/migrations/0060_concreteextern.py b/input/migrations/0060_concreteextern.py
new file mode 100644
index 0000000..14d9809
--- /dev/null
+++ b/input/migrations/0060_concreteextern.py
@@ -0,0 +1,30 @@
+# Generated by Django 3.2.5 on 2021-07-06 10:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('input', '0059_auto_20210412_1142'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ConcreteExtern',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('realname', models.CharField(help_text='Bitte gib deinen Vornamen und deinen Nachnamen ein.', max_length=200, null=True, verbose_name='Realname')),
+                ('email', models.EmailField(help_text='Bitte gib deine E-Mail-Adresse ein, damit dich<br>Wikimedia Deutschland bei Rückfragen oder für<br>die Zusage kontaktieren kann.', max_length=200, null=True, verbose_name='E-Mail-Adresse')),
+                ('granted', models.BooleanField(null=True)),
+                ('granted_date', models.DateField(null=True)),
+                ('survey_mail_send', models.BooleanField(default=False, verbose_name='Keine Umfragemail schicken')),
+                ('survey_mail_date', models.DateField(blank=True, null=True, verbose_name='Umfragemail wurde verschickt am')),
+                ('username', models.CharField(help_text='Bitte gib den Namen ein, mit dem du dich<br>in den Wikimedia-Projekten registriert hast.', max_length=200, null=True, verbose_name='Benutzer_innenname')),
+                ('service_id', models.CharField(blank=True, max_length=15, null=True)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]
diff --git a/input/models.py b/input/models.py
index c01db7d..69a845e 100644
--- a/input/models.py
+++ b/input/models.py
@@ -17,7 +17,7 @@ class Volunteer(models.Model):
     granted_date = models.DateField(null=True)
     survey_mail_send = models.BooleanField(default=False, verbose_name='Keine Umfragemail schicken')
     survey_mail_date = models.DateField(verbose_name='Umfragemail wurde verschickt am', null=True, blank=True)
-    
+
     @classmethod
     def set_granted(cl, key, b):
         obj = cl.objects.get(pk=key)
@@ -46,6 +46,10 @@ class Extern(Volunteer):
     class Meta:
         abstract = True
 
+class ConcreteExtern(Extern):
+    ''' needed because we can't initiate abstract base classes in the view'''
+    pass
+
 class Project(Volunteer):
     name = models.CharField(max_length=200, verbose_name='Name des Projekts')
     description = models.CharField(max_length=500, verbose_name="Kurzbeschreibung", null=True)