title: Hook django up with postgresql using psycopg2
body: <p>I am trying to hook my website up to use postgresql. I installed postgresql and psycopg2. In settings.py, I placed the following, and then got the error shown afterwards. I should mention that I tested the site with mysql before attempting to migrate to postresql.</p>
  
  <p>from Settings.py:</p>
  
  <pre><code>DATABASES = {
  
  'default': {
      'ENGINE': 'django.db.backends.postgresql_psycopg2',
      'NAME': 'pdbt', 
      'USER': '',
      'PASSWORD': '',
      'HOST': 'localhost',
      'PORT': '', 
  }
  }
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>DatabaseError at /viewer/
  
  relation "django_session" does not exist
  
  LINE 1: ...ession_data", "django_session"."expire_date" FROM "django_se...
  </code></pre>