diff --git a/app/models/post.rb b/app/models/post.rb
index adccaf0d003..db19fa62db0 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -1320,6 +1320,7 @@ end
 #  index_posts_on_id_topic_id_where_not_deleted_or_empty  (id,topic_id) WHERE ((deleted_at IS NULL) AND (raw <> ''::text))
 #  index_posts_on_image_upload_id                         (image_upload_id)
 #  index_posts_on_reply_to_post_number                    (reply_to_post_number)
+#  index_posts_on_topic_id_and_created_at                 (topic_id,created_at)
 #  index_posts_on_topic_id_and_percent_rank               (topic_id,percent_rank)
 #  index_posts_on_topic_id_and_post_number                (topic_id,post_number) UNIQUE
 #  index_posts_on_topic_id_and_sort_order                 (topic_id,sort_order)
diff --git a/db/migrate/20230727015030_add_index_topic_id_created_at_on_posts.rb b/db/migrate/20230727015030_add_index_topic_id_created_at_on_posts.rb
new file mode 100644
index 00000000000..8a983138ae7
--- /dev/null
+++ b/db/migrate/20230727015030_add_index_topic_id_created_at_on_posts.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class AddIndexTopicIdCreatedAtOnPosts < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+
+  def up
+    remove_index :posts, %i[topic_id created_at], algorithm: :concurrently, if_exists: true
+    add_index :posts, %i[topic_id created_at], algorithm: :concurrently
+  end
+
+  def down
+    remove_index :posts, %i[topic_id created_at], algorithm: :concurrently, if_exists: true
+  end
+end