Update all logs in rake task but without validation

lib/tasks/recalculate_vacdays.rake

@@ -1,5 +1,11 @@
 desc "Recalculate vacdays after bugfix for daylight savings time changes"
 task recalculate_vacdays: :environment do
-  logs = LettingsLog.filter_by_years(%w[2023 2024]).where.not(vacdays: nil)
+  logs = LettingsLog.where.not(vacdays: nil)
-  logs.each(&:save!)
+  logs.each do |log|
+    recalculated_vacdays = log.send(:property_vacant_days)
+    next if recalculated_vacdays == log.vacdays
+
+    log.vacdays = recalculated_vacdays
+    log.save!(validate: false)
+  end
 end