Merge indexes for reblog on statuses table (#5831)

We added an index for `[account_id, reblog_of_id]`, but we already have a similar index for `reblog_of_id`. Those index will be bigger according to statuses count. For example, `reblog_of_id` index uses 800MB for 10GB statuses table.

So this patch swaps indexed columns like `[reblog_of_id, account_id]`, then it will covers both usage with single index.

Since those index creation may take a while, I've also disabled previous index creation.

1 files changed, 2 insertions, 3 deletions

diff --git a/db/schema.rb b/db/schema.rb
index 7422bd127..120b15950 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171125031751) do
+ActiveRecord::Schema.define(version: 20171125190735) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -409,10 +409,9 @@ ActiveRecord::Schema.define(version: 20171125031751) do
     t.bigint "application_id"
     t.bigint "in_reply_to_account_id"
     t.index ["account_id", "id"], name: "index_statuses_on_account_id_id"
-    t.index ["account_id", "reblog_of_id"], name: "index_statuses_on_account_id_and_reblog_of_id"
     t.index ["conversation_id"], name: "index_statuses_on_conversation_id"
     t.index ["in_reply_to_id"], name: "index_statuses_on_in_reply_to_id"
-    t.index ["reblog_of_id"], name: "index_statuses_on_reblog_of_id"
+    t.index ["reblog_of_id", "account_id"], name: "index_statuses_on_reblog_of_id_and_account_id"
     t.index ["uri"], name: "index_statuses_on_uri", unique: true
   end