From a5d0e0f2772fe3d91d9262ef9b9be644da6128fc Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Tue, 19 Jul 2016 10:29:07 +1000
Subject: [PATCH] PERF: index for deleted posts in a topic to speed up
 has_deleted detection

---
 db/migrate/20160719002225_add_deleted_post_index_to_posts.rb | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 db/migrate/20160719002225_add_deleted_post_index_to_posts.rb

diff --git a/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb b/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb
new file mode 100644
index 000000000..ec469b99c
--- /dev/null
+++ b/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb
@@ -0,0 +1,5 @@
+class AddDeletedPostIndexToPosts < ActiveRecord::Migration
+  def change
+    add_index :posts, [:topic_id, :post_number], where: 'deleted_at IS NOT NULL', name: 'idx_posts_deleted_posts'
+  end
+end