Fix ScheduledDowntimes replicating on restart

fixes #4272

lib/icinga/scheduleddowntime.cpp

@@ -176,6 +176,9 @@ void ScheduledDowntime::CreateNextDowntime()
 		return;
 	}
 
+	Log(LogDebug, "ScheduledDowntime")
+		<< "Creating new Downtime for ScheduledDowntime \"" << GetName() << "\"";
+
 	std::pair<double, double> segment = FindNextSegment();
 
 	if (segment.first == 0 && segment.second == 0) {

lib/icinga/scheduleddowntime.ti

@@ -36,6 +36,10 @@ public:
 
 class ScheduledDowntime : CustomVarObject < ScheduledDowntimeNameComposer
 {
+	// Scheduled Downtimes have a dependency on Downtimes. This is to make sure ScheduledDowntimes are activated after
+	// the Downtimes (and other checkables)
+	activation_priority 20;
+
 	load_after Host;
 	load_after Service;