{
  config,
  pkgs,
  lib,
  ...
}:
let
  cfg = config.services.matrix-synapse;
  pushers = lib.range 0 (cfg.pushers - 1);
in
{
  config = lib.mkIf (cfg.pushers > 0) {
    services.matrix-synapse = {
      settings = {
        instance_map = lib.listToAttrs (
          lib.map (index: {
            name = "pusher-${toString index}";
            value = {
              path = "/run/matrix-synapse/pusher-${toString index}.sock";
            };
          }) pushers
        );

        pusher_instances = lib.map (index: "pusher-${toString index}") pushers;
      };

      workers = lib.listToAttrs (
        lib.map (index: {
          name = "pusher-${toString index}";
          value = {
            worker_app = "synapse.app.generic_worker";
            worker_listeners = [
              {
                type = "http";
                path = "/run/matrix-synapse/pusher-${toString index}.sock";
                resources = [
                  {
                    names = [ "replication" ];
                    compress = false;
                  }
                ];
              }
            ];
            database = (
              import ../db.nix {
                workerName = "pusher-${toString index}";
                dbGroup = "small";
              }
            );
          };
        }) pushers
      );
    };
  };
}