fetch("/api/buildings")
  .then((res) => res.json())
  .then((buildings) => {
    buildings.forEach((building) => {
      const element = document.querySelector(
        `.building[data-id="${building.id}"]`,
      );

      if (!element) return;

      let title = element.querySelector("title");

      // Falls kein title existiert → erstellen
      if (!title) {
        title = document.createElementNS("http://www.w3.org/2000/svg", "title");
        element.prepend(title);
      }

      title.textContent = building.name;
    });
  });