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

StreamEntry model. Simply render Salmon slaps as they are needed

app/services/unfollow_service.rb

@@ -1,14 +1,33 @@
 # frozen_string_literal: true
 
 class UnfollowService < BaseService
-  include StreamEntryRenderer
-
   # Unfollow and notify the remote user
   # @param [Account] source_account Where to unfollow from
   # @param [Account] target_account Which to unfollow
   def call(source_account, target_account)
     follow = source_account.unfollow!(target_account)
-    NotificationWorker.perform_async(stream_entry_to_xml(follow.stream_entry), source_account.id, target_account.id) unless target_account.local?
+    NotificationWorker.perform_async(build_xml(follow), source_account.id, target_account.id) unless target_account.local?
     UnmergeWorker.perform_async(target_account.id, source_account.id)
   end
+
+  private
+
+  def build_xml(follow)
+    Nokogiri::XML::Builder.new do |xml|
+      entry(xml, true) do
+        title xml, "#{follow.account.acct} is no longer following #{follow.target_account.acct}"
+
+        author(xml) do
+          include_author xml, follow.account
+        end
+
+        object_type xml, :activity
+        verb xml, :unfollow
+
+        target(xml) do
+          include_author xml, follow.target_account
+        end
+      end
+    end.to_xml
+  end
 end