old_contents: import os
  import pathlib
  
  BASE_DIR = pathlib.Path(__file__).resolve().parent
  
  SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
  
  SQLALCHEMY_MIGRATE_REPO = str(BASE_DIR / 'migrations')
  SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  SECRET_KEY = 'double-secret-probation'
  
new_contents: import os
  import pathlib
  
  BASE_DIR = pathlib.Path(__file__).resolve().parent
  
  SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
  
  SQLALCHEMY_MIGRATE_REPO = str(BASE_DIR / 'migrations')
  SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  SECRET_KEY = os.environ['SECRET_KEY']
  
subject: move secret key to environ