Fix: 限定投稿新規追加時の負荷 (#321)

db/migrate/20231130083634_add_index_on_statuses_conversation_id.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexOnStatusesConversationId < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :statuses, :conversation_id, algorithm: :concurrently
+  end
+end