old_contents: WTF_CSRF_ENABLED = True
  
  import os
  basedir = os.path.abspath(os.path.dirname(__file__))
  
  class BaseConfig(object):
      SECRET_KEY = 'you-will-never-guess'
      SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'app.db')
      SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')
      SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  class TestConfig(BaseConfig):
      DEBUG = True
      TESTING = True
      WTF_CSRF_ENABLED = False
      SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
  
new_contents: WTF_CSRF_ENABLED = True
  
  import os
  basedir = os.path.abspath(os.path.dirname(__file__))
  
  class BaseConfig(object):
      SECRET_KEY = 'you-will-never-guess'
      SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'app.db')
      SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')
      SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  
  class TestConfig(BaseConfig):
      DEBUG = True
      TESTING = True
      WTF_CSRF_ENABLED = False
      SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
  
  
  class HerokuDeployConfig(object):
      SECRET_KEY = 'thisPasswordIsSoDarnAmazinglyStrong123!'
      SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
      SQLALCHEMY_TRACK_MODIFICATIONS = False
  
subject: create a new config for heroku deployment