Remove unfollowed hashtag posts from home feed (#26028)

app/workers/tag_unmerge_worker.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class TagUnmergeWorker
+  include Sidekiq::Worker
+  include DatabaseHelper
+
+  sidekiq_options queue: 'pull'
+
+  def perform(from_tag_id, into_account_id)
+    with_primary do
+      @from_tag     = Tag.find(from_tag_id)
+      @into_account = Account.find(into_account_id)
+    end
+
+    with_read_replica do
+      FeedManager.instance.unmerge_tag_from_home(@from_tag, @into_account)
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end