Index: src/server.js
===================================================================
--- src/server.js	(revision b300682efae63352c2693b70b56e27061543450b)
+++ src/server.js	(revision 25d4041f989e999fe4673b2c9ac3e03f874f5980)
@@ -44,4 +44,5 @@
 import postsRoutes from './routes/posts.js';
 import federationRoutes from './routes/federation.js';
+import { startCircleSyncLoop } from './services/CircleService.js';
 
 if (!process.env.SESSION_SECRET) {
@@ -146,4 +147,7 @@
 initializeDatabase();
 
+// Cirkels: periodieke achtergrond-sync van remote instances (no-op tenzij tenancy='circle').
+startCircleSyncLoop();
+
 // Bundle HTMX: copy from node_modules into our own assets dir so we can serve
 // it locally (no third-party CDN). Idempotent — only copies if size differs.