postgresql plugins

example.nix

    let
      mkPlug = p: p.override { postgresql = config.services.postgresql.package; };
    in {
      enable = true;
      package = pgsql;
      dataDir = "/data/pgsql";

      extraConfig = "shared_preload_libraries = 'timescaledb'";
      extraPlugins = with pkgs; map mkPlug
        [ postgis
          timescaledb
          cstore_fdw
          pg_hll
          pg_cron
          pg_topn
        ];
    };