Try validations in rake tasks and log when needing to skip them

lib/tasks/recalculate_vacdays.rake

@@ -2,9 +2,15 @@ desc "Recalculate vacdays after bugfix for daylight savings time changes"
 task recalculate_vacdays: :environment do
   logs = LettingsLog.where.not(vacdays: nil)
   logs.each do |log|
+    Rails.logger.log("Log #{log.id}")
     recalculated_vacdays = log.send(:property_vacant_days)
     next if recalculated_vacdays == log.vacdays
 
+    log.vacdays = recalculated_vacdays
+    next if log.save
+
+    Rails.logger.log("Log #{log.id} could not be saved, saving updated vacdays without validation")
+    log.reload
     log.vacdays = recalculated_vacdays
     log.save!(validate: false)
   end