[Python] IntegrityError at /admin/api/user/6/change/ FOREIGN KEY constraint failed

I am developing a website on django. When I am trying to delete a user via admin panel i get an error. I can change e.g. staff status (while still getting an error, but changes are getting apllied) The code is below:

models.py

from django.contrib.auth.models import AbstractUser
from django.db import models


class User(AbstractUser):

emailSpam = models.BooleanField(default=True)
email = models.EmailField('email', unique=True)

first_name = None
last_name = None

confirmedEmail = models.BooleanField(default=False)

REQUIRED_FIELDS = ["emailSpam"]


forms.py

from django.contrib.auth.forms import UserCreationForm, UserChangeForm

from .models import User


class CustomUserCreationForm(UserCreationForm):

class Meta:
model = User
fields = ('email',)


class CustomUserChangeForm(UserChangeForm):

class Meta:
model = User
fields = ('email',)


admin.py

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin

from .forms import CustomUserCreationForm, CustomUserChangeForm
from .models import User


class Admin(UserAdmin):
add_form = CustomUserCreationForm
form = CustomUserChangeForm
model = User
list_display = ('email', 'is_staff', 'is_active',)
list_filter = ('email', 'is_staff', 'is_active',)
fieldsets = (
(None, {'fields': ('email', 'password')}),
('Permissions', {'fields': ('is_staff', 'is_active')}),
)
add_fieldsets = (
(None, {
'classes': ('wide',),
'fields': ('email', 'password1', 'password2', 'is_staff', 'is_active')}
),
)
search_fields = ('email',)
ordering = ('email',)


admin.site.register(User, Admin)




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