Как в Django сделать уникальный url профиля, который пользователь сможет изменять , но с проверкой существует ли уже такой url

Как в Django сделать уникальный url профиля, который пользователь сможет изменять , но с проверкой существует ли уже такой url? Хочу сделать так как у VK с профилями, типо по схеме: при регистрации пользователю присваевается рандомный url, а потом пользователь может поменять url на свой в профиле. Полазил в интернет но так и не понял, как это сделать в моём коде.

apps.py

from django.apps import AppConfig


class ProfilesConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'profiles'

    def ready(self):
        import profiles.signals  # noqa

forms.py

from django import forms

from django.contrib.auth.models import User
from .models import Profile


class UpdateUserForm(forms.ModelForm):
    username = forms.CharField(max_length=100, required=True, widget=forms.TextInput(attrs={'class': ''})) # form-control
    email = forms.EmailField(required=True, widget=forms.TextInput(attrs={'class': ''})) # form-control

    class Meta:
        model = User
        fields = ['username', 'email']


class UpdateProfileForm(forms.ModelForm):
    avatar = forms.ImageField(widget=forms.FileInput(attrs={'class': 'input-file', 'id': 'file'})) # form-control-file
    bio = forms.CharField(widget=forms.Textarea(attrs={'class': 'textarea_bio', 'rows': 5})) # form-control

    class Meta:
        model = Profile
        fields = ['avatar', 'bio']

models.py

from django.db import models
from django.contrib.auth.models import User
from PIL import Image

# Extending User Model Using a One-To-One Link
class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)

    avatar = models.ImageField(default='profile_images/default.jpg', upload_to='profile_images')
    bio = models.TextField()

    def __str__(self):
        return self.user.username

    def save(self, *args, **kwargs):
        super().save()

        img = Image.open(self.avatar.path)

        if img.height > 200 or img.width > 200:  #100
            new_img = (200, 200)  #100
            img.thumbnail(new_img)
            img.save(self.avatar.path)

signals.py

from django.db.models.signals import post_save
from django.contrib.auth.models import User
from django.dispatch import receiver

from .models import Profile


@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)


@receiver(post_save, sender=User)
def save_profile(sender, instance, **kwargs):
    instance.profile.save()

views.py

from django.shortcuts import render, redirect
from django.contrib import messages
from django.contrib.auth.decorators import login_required

from .forms import UpdateUserForm, UpdateProfileForm


@login_required
def profile(request):
    if request.method == 'POST':
        user_form = UpdateUserForm(request.POST, instance=request.user)
        profile_form = UpdateProfileForm(request.POST, request.FILES, instance=request.user.profile)

        if user_form.is_valid() and profile_form.is_valid():
            user_form.save()
            profile_form.save()
            messages.success(request, 'Your profile is updated successfully')
            return redirect(to='profiles:users-profile')
    else:
        user_form = UpdateUserForm(instance=request.user)
        profile_form = UpdateProfileForm(instance=request.user.profile)

    return render(request, 'profiles/profile.html', {'user_form': user_form, 'profile_form': profile_form})


from django.urls import reverse_lazy
from django.contrib.auth.views import PasswordChangeView
from django.contrib.messages.views import SuccessMessageMixin


class ChangePasswordView(SuccessMessageMixin, PasswordChangeView):
    template_name = 'users/change_password.html'
    success_message = "Successfully Changed Your Password"
    success_url = reverse_lazy('users-home')

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