Update postgres backend and remove failover router for Django 3 (#10011)

Co-authored-by: John Tordoff <>

Author: Johnetordoff

api/base/settings/defaults.py

@@ -22,7 +22,7 @@
 DATABASES = {
     'default': {
         'CONN_MAX_AGE': 0,
-        'ENGINE': 'osf.db.backends.postgresql',  # django.db.backends.postgresql
+        'ENGINE': 'django.db.backends.postgresql',
         'NAME': os.environ.get('OSF_DB_NAME', 'osf'),
         'USER': os.environ.get('OSF_DB_USER', 'postgres'),
         'PASSWORD': os.environ.get('OSF_DB_PASSWORD', ''),
@@ -35,7 +35,6 @@
     },
 }
 
-DATABASE_ROUTERS = ['osf.db.router.PostgreSQLFailoverRouter', ]
 PASSWORD_HASHERS = [
     'django.contrib.auth.hashers.BCryptSHA256PasswordHasher',
     'django.contrib.auth.hashers.BCryptPasswordHasher',