[Django]Publish Date, Timestamp & Updated

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from django.conf import settings
from django.db import models

# Create your models here.

User = settings.AUTH_USER_MODEL


class BlogPost(models.Model):  # blogpost_set > queryset
    # id = models.IntegerField()    # pk
    user = models.ForeignKey(User, default=1, null=True, on_delete=models.SET_NULL)
    title = models.CharField(max_length=120)
    slug = models.SlugField(unique=True)  # hello world > hello-world
    content = models.TextField(null=True, blank=True)
    publish_date = models.DateTimeField(
        auto_now=False, auto_now_add=False, null=True, blank=True
    )
    timestamp = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["-publish_date", "-updated", "-timestamp"]

    def get_absolute_url(self):
        return f"/blog/{self.slug}"

    def get_edit_url(self):
        return f"{self.get_absolute_url()}/edit"

    def get_delete_url(self):
        return f"{self.get_absolute_url()}/delete"