Tell Rubocop and devs about bulk insert

app/models/exchange.rb

@@ -108,10 +108,13 @@ class Exchange < ApplicationRecord
 
   private
 
+  # An Order Cycle can have thousands of ExchangeVariants.
+  # It's a simple association without any callbacks on creation. So we can
+  # insert in bulk and improve the performance tenfold for large order cycles.
   def clone_all_exchange_variants(exchange_id)
     return unless variant_ids.any?
 
-    ExchangeVariant.insert_all(
+    ExchangeVariant.insert_all( # rubocop:disable Rails/SkipsModelValidations
       variant_ids.map{ |variant_id| { variant_id: variant_id, exchange_id: exchange_id } }
     )
   end