input: Write a function to create a Django model for a newsfeed entry, and then create a view to list all entries. Ensure that the view returns all entries in the context.
  assert 'NewsFeedEntry' in globals()
  assert callable(index)
  assert 'entries' in index.__code__.co_varnames
output: from django.db import models
  from django.shortcuts import render
  from django.http import HttpResponse
  
  # Define the NewsFeedEntry model
  class NewsFeedEntry(models.Model):
      title = models.CharField(max_length=200)
      content = models.TextField()
      created_at = models.DateTimeField(auto_now_add=True)
      updated_at = models.DateTimeField(auto_now=True)
  
      def __str__(self):
          return self.title
  
  # Define the view to list all entries
  def index(request):
      entries = NewsFeedEntry.objects.all()
      return render(request, 'newsfeed/index.html', {'entries': entries})