anchor.diff:          requiredBy = [ "mailman-uwsgi.service" ];
           restartTriggers = [ config.environment.etc."mailman3/settings.py".source ];
           script = ''
  -          [[ -e "${settings.STATIC_ROOT}" ]] && find "${settings.STATIC_ROOT}/" -mindepth 1 -delete
  +          [[ -e "${webSettings.STATIC_ROOT}" ]] && find "${webSettings.STATIC_ROOT}/" -mindepth 1 -delete
             ${pythonEnv}/bin/mailman-web migrate
             ${pythonEnv}/bin/mailman-web collectstatic
             ${pythonEnv}/bin/mailman-web compress
  
positive.code:   ###### implementation
  
    config = mkIf cfg.enable {
  
      assertions = let
        inherit (config.services) postfix;
  
negative.code: 
        import json
  
        with open('${webSettingsJSON}') as f:
            globals().update(json.load(f))
  
        with open('/var/lib/mailman-web/settings_local.json') as f:
  