structuredAttrs is enabled

trying https://github.com/nix-community/nix-index-database/releases/download/2026-09-13-074012/index-x86_64-linux
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100 102.1M 100 102.1M   0      0 28.20M      0   00:03   00:03         29.69M