old_contents: """This module contains various configuration options."""
  
  
  class Config:
      """Base configuration."""
  
      SQLALCHEMY_COMMIT_ON_TEARDOWN = True
  
  
  class DevConfig(Config):
      """Development configuration."""
  
      DEBUG = True
      DATABASE_URI = 'sqlite:///dbucketlist.db'
  
  
  class TestConfig(Config):
      """Testing configuration."""
  
      TESTING = True
      DATABASE_URI = 'sqlite:///tbucketlist.db'
  
  
  class ProductionConfig(Config):
      """Production configurations."""
  
      DEBUG = False
      DATABASE_URI = 'sqlite:///bucketlist.db'
  
  config = {
      'development': DevConfig,
      'testing': TestConfig,
      'Production': ProductionConfig
  }
  
new_contents: """This module contains various configuration options."""
  
  
  class Config:
      """Base configuration."""
  
      SQLALCHEMY_COMMIT_ON_TEARDOWN = True
  
  
  class DevConfig(Config):
      """Development configuration."""
  
      DEBUG = True
      DATABASE_URI = 'sqlite:///dbucketlist.db'
      SQLALCHEMY_TRACK_MODIFICATIONS = True
  
  
  class TestConfig(Config):
      """Testing configuration."""
  
      TESTING = True
      DATABASE_URI = 'sqlite:///tbucketlist.db'
  
  
  class ProductionConfig(Config):
      """Production configurations."""
  
      DEBUG = False
      DATABASE_URI = 'sqlite:///bucketlist.db'
  
  config = {
      'development': DevConfig,
      'testing': TestConfig,
      'Production': ProductionConfig
  }
  
subject: Enable SQLALCHEMY_TRACK_MODIFICATIONS.