bring back optional field

app/models/lettings_log.rb

@@ -73,7 +73,7 @@ class LettingsLog < Log
   }
 
   AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at].freeze
-  OPTIONAL_FIELDS = %w[tenancycode propcode chcharge].freeze
+  OPTIONAL_FIELDS = %w[first_time_property_let_as_social_housing tenancycode propcode chcharge].freeze
   RENT_TYPE_MAPPING_LABELS = { 1 => "Social Rent", 2 => "Affordable Rent", 3 => "Intermediate Rent" }.freeze
   HAS_BENEFITS_OPTIONS = [1, 6, 8, 7].freeze
   NUM_OF_WEEKS_FROM_PERIOD = { 2 => 26, 3 => 13, 4 => 12, 5 => 50, 6 => 49, 7 => 48, 8 => 47, 9 => 46, 1 => 52, 10 => 53 }.freeze