Oops right, it's okay to work with an alt style we've already seen!

app/models/alt_style.rb

@@ -15,8 +15,8 @@ class AltStyle < ApplicationRecord
     # TODO: This is very similar to what `PetState` does, but like… much much
     # more compact? Idk if I'm missing something, or if I was just that much
     # more clueless back when I wrote it, lol 😅
-    biology.values.each do |asset_data|
-      self.swf_assets << SwfAsset.from_biology_data(self.body_id, asset_data)
+    self.swf_assets = biology.values.map do |asset_data|
+      SwfAsset.from_biology_data(self.body_id, asset_data)
     end
   end
 end

app/models/pet.rb

@@ -54,8 +54,8 @@ class Pet < ApplicationRecord
       raise UnexpectedDataFormat unless pet_data[:alt_color]
       raise UnexpectedDataFormat if pet_data[:biology_by_zone].empty?
 
-      @alt_style = AltStyle.new(
-        id: pet_data[:alt_style].to_i,
+      @alt_style = AltStyle.find_or_initialize_by(id: pet_data[:alt_style].to_i)
+      @alt_style.assign_attributes(
         color_id: pet_data[:alt_color].to_i,
         species_id: pet_data[:species_id].to_i,
         body_id: pet_data[:body_id].to_i,