Index: src/services/SettingsService.js
===================================================================
--- src/services/SettingsService.js	(revision 8b014efbf867f5c2687f4c1aed544e6e7ef34386)
+++ src/services/SettingsService.js	(revision 8b014efbf867f5c2687f4c1aed544e6e7ef34386)
@@ -0,0 +1,42 @@
+// Globale app-instellingen (key/value, gecached). Nu vooral de tenancy-modus.
+//
+//   tenancy = 'solo'  -> precies één site (de primaire/owner-site)
+//   tenancy = 'hub'   -> hoofdsite (bedrijf) + /gebruikers, admin wijst PrutFolio's toe
+//
+// De cache wordt bij setSetting meteen ververst, dus een toggle in Beheer werkt
+// live zonder herstart.
+
+import db from '../config/database.js';
+
+let _cache = null;
+
+function load() {
+  if (!_cache) {
+    _cache = {};
+    for (const r of db.prepare('SELECT key, value FROM app_settings').all()) {
+      _cache[r.key] = r.value;
+    }
+  }
+  return _cache;
+}
+
+export function getSetting(key, fallback = null) {
+  const v = load()[key];
+  return v === undefined ? fallback : v;
+}
+
+export function setSetting(key, value) {
+  db.prepare(`
+    INSERT INTO app_settings (key, value, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP)
+    ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = CURRENT_TIMESTAMP
+  `).run(key, String(value));
+  if (_cache) _cache[key] = String(value);
+}
+
+export function getTenancy() {
+  return getSetting('tenancy', 'solo') === 'hub' ? 'hub' : 'solo';
+}
+
+export function setTenancy(mode) {
+  setSetting('tenancy', mode === 'hub' ? 'hub' : 'solo');
+}