Code cleanups

app/jobs/migration/set_default_value_for_contact_name_job.rb

@@ -0,0 +1,12 @@
+class Migration::SetDefaultValueForContactNameJob < ApplicationJob
+  queue_as :scheduled_jobs
+
+  def perform(account)
+    account.contacts.each do |contact|
+      # Set default value for contact name if it is blank
+      # rubocop:disable Rails/SkipsModelValidations
+      contact.update_columns(name: '') if contact.name.blank?
+      # rubocop:enable Rails/SkipsModelValidations
+    end
+  end
+end

db/migrate/20230512040636_set_default_name_to_existing_contacts.rb

@@ -1,13 +1,10 @@
 class SetDefaultNameToExistingContacts < ActiveRecord::Migration[7.0]
   def change
-    Contact.where(name: nil).each do |contact|
-      contact.update(name: '')
-    end
-  end
-
-  def down
-    Contact.where(name: '').each do |contact|
-      contact.update(name: nil)
+    ::Account.find_in_batches do |account_batch|
+      Rails.logger.info "Migrated till #{account_batch.first.id}\n"
+      account_batch.each do |account|
+        Migration::SetDefaultValueForContactNameJob.perform_later(account)
+      end
     end
   end
 end