How to add a field to a schema using Ecto?

Questions & Help Questions
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1

I’m reading Programming Phoenix LiveView and in one chapter they create a User table using the CLI

$ mix phx.gen.auth Accounts User users

This generate the following schema

// lib/pento/accounts/user.ex
  schema "users" do
    field :email, :string
    field :password, :string, virtual: true, redact: true
    field :hashed_password, :string, redact: true
    field :confirmed_at, :naive_datetime

    timestamps()
  end

I want to add a new field to this schema and to my database. I added field :username, :string to the schema

  schema "users" do
    field :email, :string
    field :username, :string, null: false
    field :password, :string, virtual: true, redact: true
    field :hashed_password, :string, redact: true
    field :confirmed_at, :naive_datetime

    timestamps()
  end

And ran ecto migrate again

$ mix ecto.migrate
00:02:35.628 [info] Migrations already up
$ mix ecto.create
The database for Pento.Repo has already been created

But when I check my database the field isn’t there.

Whats the proper way to add fields and modify an schema?