anchor.diff:        {
           database = {
             path = config.accounts.email.maildirBasePath;
  +        };
  +
  +        maildir = {
  +          synchronize_flags = cfg.maildir.synchronizeFlags;
           };
   
           new = {
  
positive.code: 
        extraConfig = mkOption {
          type = types.attrsOf (types.attrsOf types.str);
          default = {
            maildir = { synchronize_flags = "true"; };
          };
          description = ''
            Options that should be appended to the notmuch configuration file.
          '';
  
negative.code:           description = ''
              Bash statements run after a message has been inserted
              into the database and initial tags have been applied.
            '';
          };
        };
  
        maildir = {
          synchronizeFlags = mkOption {
            type = types.bool;
            default = true;
            description = ''
              Whether to synchronize Maildir flags.
            '';
          };
        };
  