diff --git a/backend/routes/osm.py b/backend/routes/osm.py
index baf653a..0384afc 100644
--- a/backend/routes/osm.py
+++ b/backend/routes/osm.py
@@ -180,10 +180,12 @@ async def get_pois(
         stale = _stale_tiles(type, tiles)
 
         if stale and not fast:
-            # Hintergrund-Task mit gespeicherter Referenz (GC-sicher)
+            logger.info(f"OSM BG-Start: {type} {len(stale)} stale Tiles")
             async def _bg_fetch(poi_type, stale_tiles):
+                logger.info(f"OSM BG-Task läuft: {poi_type} {len(stale_tiles)} Tiles")
                 for (x, y) in stale_tiles:
                     await _fetch_and_store_tile(poi_type, x, y)
+                logger.info(f"OSM BG-Task fertig: {poi_type}")
             task = asyncio.create_task(_bg_fetch(type, stale))
             _bg_tasks.add(task)
             task.add_done_callback(_bg_tasks.discard)