Pokus o hack: při výrobě modelu na něj rovnou přesměrujeme původní contenttype.

various/migrations/0001_initial.py

@@ -2,6 +2,15 @@
 
 from django.db import migrations, models
 
+def nastav_nove_contenttypes(apps, schema_editor):
+    ContentType = apps.get_model('contenttypes', 'ContentType')
+    old_ct = ContentType.objects.get_by_natural_key('seminar', 'nastaveni')
+    old_ct.update(appname='various')
+
+def nastav_stare_contenttypes(apps, schema_editor):
+    ContentType = apps.get_model('contenttypes', 'ContentType')
+    new_ct = ContentType.objects.get_by_natural_key('various', 'nastaveni')
+    new_ct.update(appname='seminar')
 
 class Migration(migrations.Migration):
 
@@ -24,4 +33,5 @@ class Migration(migrations.Migration):
                 'managed': False,
             },
         ),
+        migrations.RunPython(nastav_nove_contenttypes, nastav_stare_contenttypes),
     ]

various/migrations/0003_fix_permissions.py

@@ -37,5 +37,4 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(oprav_prava_k_nastaveni, obnov_prava_k_nastaveni),
     ]