{
  description = "CentralCloud OnCall — Grafana OnCall fork (Python/Django + Node.js/pnpm)";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    flake-utils.url = "github:numtide/flake-utils";
  };

  nixConfig = {
    extra-substituters = [
      "https://cache.centralcloud.com/default"
    ];
    extra-trusted-public-keys = [
      "default:ywfU21WX06iOn2Ec2lae1jYh4w8LO4IQkmp06vJzsk8="
    ];
  };

  outputs = {
    nixpkgs,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {inherit system;};
    in {
      devShells.default = pkgs.mkShell {
        packages = with pkgs; [
          # Python engine
          python312
          python312Packages.pip
          python312Packages.virtualenv
          uv

          # Frontend (grafana-plugin)
          nodejs_20
          nodePackages.pnpm

          # Dev tooling
          gnumake
          git
          jq
          curl

          # Local service dependencies (for running without docker)
          postgresql_16
          redis
          rabbitmq-server
        ];

        shellHook = ''
          echo "CentralCloud OnCall dev shell"
          echo "  python : $(python --version)"
          echo "  node   : $(node --version)"
          echo "  pnpm   : $(pnpm --version)"
          echo ""
          echo "Engine:   cd engine && uv sync && source .venv/bin/activate"
          echo "Frontend: cd grafana-plugin && pnpm install && pnpm dev"
          echo "Compose:  docker compose up -d (db, redis, rabbitmq)"
        '';
      };
    });
}