title: Postgres data loss
body: <p>We have an app hosted on Heroku. Recently, I witnessed data being lost from the postgres database. The app is made with django, and there are news articles. So I edited the title of an article and saved it. I could see that changes were saved in the django admin and on the site the corrected title appeared. But after a while, the old version of the title reappeared on the site. So I edited the title for the second time, and the same thing happened again. This time, it took sometime between 1 and 30 minutes for the old version to reappear.</p>
  
  <p>I am completely confused to what might be happening here. There is no indication of any kind of error in the logs.</p>
  
  <p>I asked Heroku support for assistance, but without being able to reproduce the error, they couldn't really do much.</p>
  
  <p>This phenomenon happened twice. I'd like to understand it so if anyone has a theory, please share it.</p>
  
  <p>Thanks!</p>