Add index to webhooks type column

changelogs/unreleased/fix-web_hooks-index.yml

+---
+title: Add index to webhooks type column
+merge_request:
+author:

db/migrate/20170424142900_add_index_to_web_hooks_type.rb

+class AddIndexToWebHooksType < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :web_hooks, :type
+  end
+
+  def down
+    remove_concurrent_index :web_hooks, :type
+  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: 20170423064036) do
+ActiveRecord::Schema.define(version: 20170424142900) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1371,6 +1371,7 @@ ActiveRecord::Schema.define(version: 20170423064036) do
   end
 
   add_index "web_hooks", ["project_id"], name: "index_web_hooks_on_project_id", using: :btree
+  add_index "web_hooks", ["type"], name: "index_web_hooks_on_type", using: :btree
 
   add_foreign_key "boards", "projects"
   add_foreign_key "chat_teams", "namespaces", on_delete: :cascade