Change lists to reflect added and removed users retroactively (#32930)

app/workers/merge_worker.rb

@@ -5,18 +5,42 @@ class MergeWorker
   include Redisable
   include DatabaseHelper
 
-  def perform(from_account_id, into_account_id)
+  def perform(from_account_id, into_id, type = 'home')
     with_primary do
       @from_account = Account.find(from_account_id)
+    end
+
+    case type
+    when 'home'
+      merge_into_home!(into_id)
+    when 'list'
+      merge_into_list!(into_id)
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+
+  private
+
+  def merge_into_home!(into_account_id)
+    with_primary do
       @into_account = Account.find(into_account_id)
     end
 
     with_read_replica do
       FeedManager.instance.merge_into_home(@from_account, @into_account)
     end
-  rescue ActiveRecord::RecordNotFound
-    true
   ensure
     redis.del("account:#{into_account_id}:regeneration")
   end
+
+  def merge_into_list!(into_list_id)
+    with_primary do
+      @into_list = List.find(into_list_id)
+    end
+
+    with_read_replica do
+      FeedManager.instance.merge_into_list(@from_account, @into_list)
+    end
+  end
 end