Stop trying to shoehorn all Salmon updates into the poor database-connected

StreamEntry model. Simply render Salmon slaps as they are needed

app/services/unfavourite_service.rb

@@ -1,16 +1,37 @@
 # frozen_string_literal: true
 
 class UnfavouriteService < BaseService
-  include StreamEntryRenderer
-
   def call(account, status)
     favourite = Favourite.find_by!(account: account, status: status)
     favourite.destroy!
 
-    unless status.local?
-      NotificationWorker.perform_async(stream_entry_to_xml(favourite.stream_entry), account.id, status.account_id)
-    end
+    NotificationWorker.perform_async(build_xml(favourite), account.id, status.account_id) unless status.local?
 
     favourite
   end
+
+  private
+
+  def build_xml(favourite)
+    Nokogiri::XML::Builder.new do |xml|
+      entry(xml, true) do
+        title xml, "#{favourite.account.acct} no longer favourites a status by #{favourite.status.account.acct}"
+
+        author(xml) do
+          include_author xml, favourite.account
+        end
+
+        object_type xml, :activity
+        verb xml, :unfavourite
+
+        target(xml) do
+          author(xml) do
+            include_author xml, favourite.status.account
+          end
+
+          include_entry xml, favourite.status.stream_entry
+        end
+      end
+    end.to_xml
+  end
 end