{
  config,
  lib,
  ...
}: {
  options = {
    services.ollama.impermanence.enable = lib.mkOption {
      type = lib.types.bool;
      default = config.services.ollama.enable && config.storage.impermanence.enable;
    };
  };

  config = lib.mkIf config.services.ollama.enable (
    lib.mkMerge [
      (lib.mkIf config.storage.zfs.enable (lib.mkMerge [
        {
          # Ollama needs persistent storage for models and configuration
        }
        (lib.mkIf (!config.services.ollama.impermanence.enable) {
          # TODO: placeholder to configure a unique dataset for this service
        })
        (lib.mkIf config.services.ollama.impermanence.enable {
          storage.impermanence.datasets."persist/system/root" = {
            directories."/var/lib/private/ollama" = {
              enable = true;
              owner.name = config.services.ollama.user;
              group.name = config.services.ollama.group;
              owner.permissions = {
                read = true;
                write = true;
                execute = false;
              };
              group.permissions = {
                read = false;
                write = false;
                execute = false;
              };
              other.permissions = {
                read = false;
                write = false;
                execute = false;
              };
            };
          };
        })
      ]))
    ]
  );
}