explicitely set PK default to BigAutoField

core/migrations/0003_use_big_auto_fields.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.0 on 2021-12-19 16:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0002_auto_20210118_2334'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='subject',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+        migrations.AlterField(
+            model_name='transaction',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+    ]

financeproject/settings.py

@@ -93,6 +93,8 @@ DATABASES = {
     }
 }
 
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
+
 AUTH_PASSWORD_VALIDATORS = [
     {"NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator", },
     {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator", },