Add index to routes table on lower path for postgresql

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/migrate/20161212142807_add_lower_path_index_to_routes.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddLowerPathIndexToRoutes < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab::Database.postgresql?
+
+    execute 'CREATE INDEX CONCURRENTLY index_on_routes_lower_path ON routes (LOWER(path));'
+  end
+
+  def down
+    return unless Gitlab::Database.postgresql?
+
+    remove_index :routes, name: :index_on_routes_lower_path
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
-ActiveRecord::Schema.define(version: 20161202152035) do
+ActiveRecord::Schema.define(version: 20161212142807) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"