Shutdown scheduler on management commands and on every exit

apps/scheduler/runtime.py

@@ -1,4 +1,13 @@
 from apscheduler.scheduler import Scheduler
 
+_lockdown = False
 scheduler = Scheduler()
-scheduler.start()
+
+
+def lockdown():
+    global _lockdown
+    _lockdown = True
+
+
+if not _lockdown:
+    scheduler.start()