01Define a `Post` model inheriting from `models.Model`
02Use `CharField` for title (max 200 chars)
03Use `TextField` for body content
04Use `ForeignKey` to link to Django's built-in `User` model
05Add `created_at` with `auto_now_add=True` and `updated_at` with `auto_now=True`
06Implement `__str__` to return the title
07Add a `Meta` class with `ordering = ['-created_at']`