remove production db setting and use sensible default

conversion_service/config/settings/common.py

@@ -103,7 +103,6 @@ MANAGERS = ADMINS
 # ------------------------------------------------------------------------------
 # See: https://docs.djangoproject.com/en/dev/ref/settings/#databases
 DATABASES = {
-    # Raises ImproperlyConfigured exception if DATABASE_URL not in os.environ
     'default': env.db("DJANGO_DATABASE_URL", default="postgis://postgres@mediatordatabase/postgres"),
 }
 DATABASES['default']['ATOMIC_REQUESTS'] = True

conversion_service/config/settings/production.py

@@ -13,7 +13,6 @@ MIDDLEWARE_CLASSES = (
 # during start if any of the corresponding environment variables aren't set.
 SECRET_KEY = env.str("DJANGO_SECRET_KEY")
 ALLOWED_HOSTS = env.list("DJANGO_ALLOWED_HOSTS")
-DATABASES['default'] = env.db("DJANGO_DATABASE_URL")
 
 INSTALLED_APPS += (
     'gunicorn',

web_frontend/config/settings/production.py

@@ -12,7 +12,6 @@ MIDDLEWARE_CLASSES = (
 # get an exception when starting, if they are not defined
 SECRET_KEY = env.str("DJANGO_SECRET_KEY")
 ALLOWED_HOSTS = env.list("DJANGO_ALLOWED_HOSTS")
-DATABASES['default'] = env.db("DJANGO_DATABASE_URL")
 
 INSTALLED_APPS += (
     'gunicorn',