DATABASES = {                                                                    
 'default': {'ENGINE': 'django.db.backends.postgresql_psycopg2', 
             'NAME': 'django',                    
             'USER': 'd',                               
             'PASSWORD': '***',                
             'HOST': '127.0.0.1',
             'PORT': '5432',                  
             'OPTIONS': { 'options': '-c search_path=django'}},
 'messenger': {'ENGINE': 'django.db.backends.postgresql_psycopg2',
               'NAME': 'django',          
               'USER': 'messenger',                      
               'PASSWORD': '***',                 
               'HOST': '127.0.0.1',                   
               'PORT': '5432',                  
               'OPTIONS': {'options': '-c search_path=messenger' }}}

class Route(object):

def allow_migrate(self, db, app_label, model=None, **hints):
      if app_label == 'messenger': 
              if db == 'messenger':
                   return True
              else:
                   return False
      else:
               return True

./manage.py makemigrations messenger
Migrations for 'messenger':
0001_initial.py:
- Create model Email
- Create model Error
- Create model EventMessenger
- Create model PhoneNumber
- Create model User
- Add field user to phonenumber
- Add field eventmessenger to error
- Add field user to error
- Add field user to email
./manage.py migrate messenger  
Operations to perform:
Apply all migrations: messenger
Running migrations:
Rendering model states... DONE
 Applying messenger.0001_initial... OK `

 ./manage.py dbshell --database messenger
 psql (9.1.20)
 django=> \c django
 Вы подключены к базе данных "django" как пользователь "messenger".
 django=> SELECT SESSION_USER, CURRENT_USER;
 session_user | current_user 
 --------------+--------------
 messenger    | messenger
 (1 строка)
 django=> \dn
 Список схем
 Имя    | Владелец  
 -----------+-----------
 django    | django
 messenger | messenger
 public    | postgres
 (3 строки)
 django=> show search_path;
 search_path   
 ----------------
 "$user",public
 (1 строка)
 django=> \dt
 Отношения не найдены.