Update method last_sync_timestamp from Last to First user

app/models/system_notification.rb

@@ -51,6 +51,6 @@ class SystemNotification < ApplicationRecord
     SystemNotification
       .order(last_time_changed_at: :desc)
       .first&.last_time_changed_at&.to_i ||
-      User.order(created_at: :desc).first&.created_at&.to_i
+      User.order(created_at: :asc).first&.created_at&.to_i
   end
 end

spec/models/system_notification_spec.rb

@@ -56,11 +56,12 @@ describe SystemNotification do
     end
 
     context 'when there is no system notifications in db' do
-      it 'returns last user created_at' do
+      it 'returns first users created_at' do
         create :user
+        create :user, created_at: Time.now + 5.seconds
 
         expect(described_class.last_sync_timestamp)
-          .to be == User.last.created_at.to_i
+          .to be == User.first.created_at.to_i
       end
     end