feat(user): use gen auth for users

priv/repo/migrations/20250812135200_create_users.exs

@@ -1,13 +0,0 @@
-defmodule LearningPhoenix.Repo.Migrations.CreateUsers do
-  use Ecto.Migration
-
-  def change do
-    create table(:users) do
-      add :name, :string
-      add :email, :string
-      add :password, :string
-
-      timestamps(type: :utc_datetime)
-    end
-  end
-end

priv/repo/migrations/20250814184559_create_users_auth_tables.exs

@@ -0,0 +1,28 @@
+defmodule LearningPhoenix.Repo.Migrations.CreateUsersAuthTables do
+  use Ecto.Migration
+
+  def change do
+    create table(:users) do
+      add :email, :string, null: false, collate: :nocase
+      add :hashed_password, :string
+      add :confirmed_at, :utc_datetime
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create unique_index(:users, [:email])
+
+    create table(:users_tokens) do
+      add :user_id, references(:users, on_delete: :delete_all), null: false
+      add :token, :binary, null: false, size: 32
+      add :context, :string, null: false
+      add :sent_to, :string
+      add :authenticated_at, :utc_datetime
+
+      timestamps(type: :utc_datetime, updated_at: false)
+    end
+
+    create index(:users_tokens, [:user_id])
+    create unique_index(:users_tokens, [:context, :token])
+  end
+end