Optimise Feature Flags DB schema

db/schema.rb

@@ -1943,18 +1943,18 @@ ActiveRecord::Schema.define(version: 20180926140319) do
     t.string "nonce", null: false
   end
 
-  create_table "operations_feature_flags", force: :cascade do |t|
+  create_table "operations_feature_flags", id: :bigserial, force: :cascade do |t|
     t.integer "project_id", null: false
     t.datetime_with_timezone "created_at", null: false
     t.datetime_with_timezone "updated_at", null: false
+    t.boolean "active", null: false
     t.string "name", null: false
     t.text "description"
-    t.boolean "active", null: false
   end
 
   add_index "operations_feature_flags", ["project_id", "name"], name: "index_operations_feature_flags_on_project_id_and_name", unique: true, using: :btree
 
-  create_table "operations_feature_flags_clients", force: :cascade do |t|
+  create_table "operations_feature_flags_clients", id: :bigserial, force: :cascade do |t|
     t.integer "project_id", null: false
     t.string "token", null: false
   end

ee/db/migrate/20180626171125_add_feature_flags_to_projects.rb

@@ -5,21 +5,21 @@ class AddFeatureFlagsToProjects < ActiveRecord::Migration
   DOWNTIME = false
 
   def change
-    create_table :operations_feature_flags do |t|
+    create_table :operations_feature_flags, id: :bigserial do |t|
       t.integer :project_id, null: false
       t.datetime_with_timezone :created_at, null: false
       t.datetime_with_timezone :updated_at, null: false
 
+      t.boolean :active, null: false
       t.string :name, null: false
       t.text :description
-      t.boolean :active, null: false
 
       t.foreign_key :projects, column: :project_id, on_delete: :cascade
 
       t.index [:project_id, :name], unique: true
     end
 
-    create_table :operations_feature_flags_clients do |t|
+    create_table :operations_feature_flags_clients, id: :bigserial  do |t|
       t.integer :project_id, null: false
       t.string :token, null: false