I did something!

various/migrations/0001_initial.py

@@ -28,6 +28,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('cena_sous', models.IntegerField(default=1000, verbose_name='Účastnický poplatek za soustředění')),
+                ('aktualni_cislo', models.ForeignKey(null=True, on_delete=models.deletion.PROTECT, to='seminar.cislo', verbose_name='Aktuální číslo')),
             ],
             options={
                 'verbose_name': 'Nastavení semináře',

various/migrations/0004_nastaveni_aktualni_cislo.py

@@ -1,21 +0,0 @@
-# Generated by Django 4.2.8 on 2024-03-12 20:44
-
-from django.db import migrations, models
-import django.db.models.deletion
-import various.models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('seminar', '0118_alter_organizator_options_alter_osoba_options_and_more'),
-        ('various', '0003_fix_permissions'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='nastaveni',
-            name='aktualni_cislo',
-            field=models.ForeignKey(default=various.models._default_aktualni_cislo, on_delete=django.db.models.deletion.PROTECT, to='seminar.cislo', verbose_name='Aktuální číslo'),
-        ),
-    ]

various/models.py

@@ -7,10 +7,6 @@ from seminar.models import Cislo
 
 from django.urls import reverse
 
-# Whatever, makemigrations chce default, má ho mít lol.
-def _default_aktualni_cislo():
-	return Cislo.objects.last().id
-
 @reversion.register(ignore_duplicates=True)
 class Nastaveni(SingletonModel):
 
@@ -22,8 +18,7 @@ class Nastaveni(SingletonModel):
 #		null=False, on_delete=models.PROTECT)
 
 	aktualni_cislo = models.ForeignKey(Cislo, verbose_name='Aktuální číslo', 
-		null=False, on_delete=models.PROTECT,
-		default=_default_aktualni_cislo,
+		null=True, blank=False, on_delete=models.PROTECT,
 		)
 
 	cena_sous = models.IntegerField(null=False,