{
  lib,
  config,
  pkgs,
  ...
}: let
  name = "postgresql";
  cfg = config.myNixOS.services.${name};
in {
  options.myNixOS.services.${name} = {
    enable = lib.mkEnableOption "${name} server";
    databases = lib.mkOption {
      type = lib.types.listOf lib.types.str;
      default = {};
      description = "PostgreSQL databases.";
    };
  };

  config = lib.mkIf cfg.enable {
    services.postgresql = {
      enable = true;
      enableTCPIP = true;
      package = pkgs.postgresql_16;

      ensureDatabases = cfg.databases;
      ensureUsers =
        lib.map (dbName: {
          name = dbName;
          ensureDBOwnership = true;
        })
        cfg.databases;

      authentication = lib.concatStringsSep "\n" (
        lib.map (dbName: ''
          host ${dbName} ${dbName} samehost trust
        '')
        cfg.databases
      );
    };
  };
}