mobilizon/priv/repo/migrations/20180110091747_create_categories.exs

defmodule Mobilizon.Repo.Migrations.CreateCategories do
  use Ecto.Migration

  def change do
    create table(:categories) do
      add(:title, :string)
      add(:description, :string)
      add(:picture, :string)

      timestamps()
    end

    create(unique_index(:categories, [:title]))
  end
end