text: """
  Application configuration settings
  """
  import os
  
  class Config:
      """
      Common configurations
      """ 
      DEBUG = True
      JWT_SECRET_KEY = os.getenv('JWT_SECRET_KEY')
      
  
  class DevelopmentConfig(Config):
      """
      Development configurations
      """
      DEBUG = True
      DATABASE = os.getenv('DEVELOPMENT_DB') or 'postgresql://test:testpassword@localhost/test_db'
  
  class TestingConfig(Config):
      """
      Testing configurations
      """
      TESTING = True
      DATABASE = os.getenv('TEST_DB') or 'postgresql://test:testpassword@localhost/test_db'
  
  class ProductionConfig(Config):
      """
      Production configurations
      """
      DEBUG = False
      DATABASE = os.getenv('DATABASE_URL')
  
  CONFIG = {
      'development': DevelopmentConfig,
      'testing': TestingConfig,
      'production': ProductionConfig,
      'default': DevelopmentConfig
  }