Update records in batches (#2400)

lib/tasks/update_created_by_values.rake

@@ -1,14 +1,14 @@
 desc "Updates created_by values for lettings and sales logs"
 task update_created_by_values: :environment do
   LettingsLog.filter_by_years(%w[2023 2024]).where.not(bulk_upload_id: nil).update_all("created_by_id = (SELECT user_id FROM bulk_uploads WHERE bulk_uploads.id = lettings_logs.bulk_upload_id)")
-  LettingsLog.filter_by_years(%w[2023 2024]).where(bulk_upload_id: nil).each do |lettings_log|
+  LettingsLog.filter_by_years(%w[2023 2024]).where(bulk_upload_id: nil, created_by: nil).find_each do |lettings_log|
     user = PaperTrail::Version.find_by(item_id: lettings_log.id, item_type: "LettingsLog", event: "create")&.actor
     lettings_log.created_by = user.presence || lettings_log.assigned_to
     lettings_log.save!(touch: false, validate: false)
   end
 
   SalesLog.filter_by_years(%w[2023 2024]).where.not(bulk_upload_id: nil).update_all("created_by_id = (SELECT user_id FROM bulk_uploads WHERE bulk_uploads.id = sales_logs.bulk_upload_id)")
-  SalesLog.filter_by_years(%w[2023 2024]).where(bulk_upload_id: nil).each do |sales_log|
+  SalesLog.filter_by_years(%w[2023 2024]).where(bulk_upload_id: nil, created_by: nil).find_each do |sales_log|
     user = PaperTrail::Version.find_by(item_id: sales_log.id, item_type: "SalesLog", event: "create")&.actor
     sales_log.created_by = user.presence || sales_log.assigned_to
     sales_log.save!(touch: false, validate: false)