old_contents: import os
  
  class Config(object):
      #common config
      pass
  
  class ProdConfig(Config):
      SECRET_KEY = 'prod - tis is secret?'
      # SQL Alchemy settings
      SQLALCHEMY_DATABASE_URI = 'sqlite:///db/app_prod.sqlite'
  
  class DevConfig(Config):
      SECRET_KEY = 'dev tis is secret?'
      DEBUG = True
      # SQL Alchemy settings
      SQLALCHEMY_DATABASE_URI = 'sqlite:///db/app_dev.sqlite'
      SQLALCHEMY_ECHO = True
  
new_contents: import os
  
  class Config(object):
      #common config
      pass
  
  class ProdConfig(Config):
      SECRET_KEY = 'prod - tis is secret?'
      # SQL Alchemy settings
      SQLALCHEMY_DATABASE_URI = 'sqlite:///db/app_db.sqlite'
  
  class DevConfig(Config):
      SECRET_KEY = 'dev tis is secret?'
      DEBUG = True
      # SQL Alchemy settings
      SQLALCHEMY_DATABASE_URI = 'sqlite:///db/app_db.sqlite'
      SQLALCHEMY_ECHO = True
  
subject: update settings