update header if start / end date changed / an activity deleted

app/Models/Activity.php

@@ -169,10 +169,9 @@ class Activity extends Model
 		$earliestStartDate = Activity::where('version_gantt_id', $this->version_gantt_id)->whereNotNull('parent_id')->oldest('start_date')->pluck('start_date')->first();
 		$latestEndDate = Activity::where('version_gantt_id', $this->version_gantt_id)->whereNotNull('parent_id')->latest('end_date')->pluck('end_date')->first();
 		if($header = Activity::where('version_gantt_id', $this->version_gantt_id)->whereNull('parent_id')->first()) {
-			$header->update([
-				"start_date" => $earliestStartDate,
-				"end_date" => $latestEndDate
-			]);
+			$header->start_date = $earliestStartDate;
+			$header->end_date = $latestEndDate;
+			$header->saveQuietly();
 		}
 	}