title: Django database backend documentation
body: <p>I want to adapt an existing db backend to a custom db engine that we are using.</p>
  
  <p>Is there any document or whitepaper that explains the design of django database backends?</p>
  
  <p>I've been searching through djangoproject and checked this question <a href="https://stackoverflow.com/questions/24441035/how-to-write-a-custom-django-relational-database-backend">how to write a custom django relational database backend</a> without any luck</p>