Checking db/schema.rb into version control

From Rails:

> This file is auto-generated from the current state of the database. Instead
> of editing this file, please use the migrations feature of Active Record to
> incrementally modify your database, and then regenerate this schema definition.
>
> Note that this schema.rb definition is the authoritative source for your
> database schema. If you need to create the application database on another
> system, you should be using db:schema:load, not running all the migrations
> from scratch. The latter is a flawed and unsustainable approach (the more migrations
> you'll amass, the slower it'll run and the greater likelihood for issues).
>
> It's strongly recommended to check this file into your version control system.