Add index to backups on user_id column (mastodon#25647)

db/migrate/20230630145300_add_index_backups_on_user_id.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexBackupsOnUserId < ActiveRecord::Migration[6.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :backups, :user_id, algorithm: :concurrently
+  end
+end

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: 2023_06_05_085711) do
+ActiveRecord::Schema.define(version: 2023_06_30_145300) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -273,6 +273,7 @@
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.bigint "dump_file_size"
+    t.index ["user_id"], name: "index_backups_on_user_id"
   end
 
   create_table "blocks", force: :cascade do |t|