Update

core/apps.py

@@ -17,6 +17,7 @@ class CoreConfig(AppConfig):
         """
         from core.scheduler import scheduler, start_scheduler
         from links.tasks import schedule_pending_pages
+        from apscheduler.triggers.interval import IntervalTrigger
         
         # Start the scheduler
         start_scheduler()
@@ -25,8 +26,7 @@ class CoreConfig(AppConfig):
         if not scheduler.get_job('schedule_pending_pages'):
             scheduler.add_job(
                 schedule_pending_pages,
-                'interval',
-                seconds=120,
+                trigger=IntervalTrigger(seconds=120),
                 id='schedule_pending_pages',
                 replace_existing=True
             )

core/scheduler.py

@@ -4,6 +4,7 @@ APScheduler configuration for background tasks
 import logging
 from apscheduler.schedulers.background import BackgroundScheduler
 from apscheduler.executors.pool import ThreadPoolExecutor
+from apscheduler.triggers.interval import IntervalTrigger
 from django.conf import settings
 
 logger = logging.getLogger(__name__)