old_contents: import os
  
  
  DATABASE_URL = os.getenv('DATABASE_URL', None)
  DB_PORT_5432_TCP_ADDR = os.getenv('DB_PORT_5432_TCP_ADDR', None)
  
  if DATABASE_URL is None:
      assert DB_PORT_5432_TCP_ADDR
      DATABASE_URL = 'postgres://postgres@{0}:5432/postgres'.format(DB_PORT_5432_TCP_ADDR)
  
new_contents: import os
  
  
  DATABASE_URL = os.getenv('THPL_DATABASE_URL', None)
  DB_PORT_5432_TCP_ADDR = os.getenv('DB_PORT_5432_TCP_ADDR', None)
  
  if DATABASE_URL is None:
      assert DB_PORT_5432_TCP_ADDR
      DATABASE_URL = 'postgres://postgres@{0}:5432/postgres'.format(DB_PORT_5432_TCP_ADDR)
  
subject: Change env var name