code: def get_last_live_chat(self):
          
          now = datetime.now()
  
          lcqs = self.get_query_set()
          lcqs = lcqs.filter(
              chat_ends_at__lte=now,
              ).order_by('-chat_ends_at')
          for itm in lcqs:
              if itm.chat_ends_at + timedelta(days=3) > now:
                  return itm
          return None
docs: Check if there is a live chat that ended in the last 3 days, and
              return it. We will display a link to it on the articles page.