code: def awaken(app, databaseurl):
      
      config = PsiturkConfig()
      config.load_config()
  
      database_size = config.get('Database Parameters', 'database_size')
  
      subprocess.call(
          "heroku addons:create heroku-postgresql:{} --app {}".format(
              database_size,
              app),
          shell=True)
  
      subprocess.call("heroku pg:wait --app {}".format(app), shell=True)
  
      conn = boto.connect_s3(
          config.get('AWS Access', 'aws_access_key_id'),
          config.get('AWS Access', 'aws_secret_access_key'),
      )
  
      bucket = conn.get_bucket(app)
      key = bucket.lookup('database.dump')
      url = key.generate_url(expires_in=300)
  
      cmd = "heroku pg:backups restore"
      subprocess.call(
          "{} '{}' DATABASE_URL --app {} --confirm {}".format(
              cmd,
              url,
              app,
              app),
          shell=True)
  
      subprocess.call(
          "heroku addons:create rediscloud:250 --app {}".format(app),
          shell=True)
  
      # Scale up the dynos.
      scale_up_dynos(app)
docs: Restore the database from a given url.