diff --git a/app/scheduler.py b/app/scheduler.py
index 12ae4f0..d2314cf 100644
--- a/app/scheduler.py
+++ b/app/scheduler.py
@@ -15,13 +15,28 @@ def _run_all_checks():
 def start_scheduler():
     """Start the background scheduler. Uses interval jobs per service."""
     scheduler = BackgroundScheduler()
+    _scheduled_ids = set()
 
-    def add_jobs():
+    def sync_jobs():
+        """Only add/remove jobs when the service list changes."""
+        nonlocal _scheduled_ids
         services = get_all_services_for_scheduler()
-        for svc in services:
-            job_id = f"service_{svc['id']}"
+        current_ids = {svc["id"] for svc in services}
+        svc_by_id = {svc["id"]: svc for svc in services}
+
+        # Remove jobs for deleted services
+        for sid in _scheduled_ids - current_ids:
+            job_id = f"service_{sid}"
             if scheduler.get_job(job_id):
                 scheduler.remove_job(job_id)
+            _scheduled_ids.discard(sid)
+
+        # Add jobs only for services that don't have one yet
+        for sid in current_ids:
+            if sid in _scheduled_ids:
+                continue
+            svc = svc_by_id[sid]
+            job_id = f"service_{sid}"
             interval = max(10, svc["interval_seconds"])
             scheduler.add_job(
                 run_check,
@@ -30,12 +45,13 @@ def start_scheduler():
                 id=job_id,
                 args=[svc["id"], svc["target"], svc["protocol"]],
             )
+            _scheduled_ids.add(sid)
 
     # Run checks immediately on startup, then schedule
     _run_all_checks()
-    add_jobs()
+    sync_jobs()
 
-    # Refresh job list every 60 seconds in case services were added
-    scheduler.add_job(add_jobs, "interval", seconds=60, id="refresh_jobs")
+    # Sync job list every 60 seconds (only adds/removes when services change)
+    scheduler.add_job(sync_jobs, "interval", seconds=60, id="sync_jobs")
 
     scheduler.start()