Add authentication

db/migrate/20250611155736_create_users.rb

@@ -0,0 +1,12 @@
+class CreateUsers < ActiveRecord::Migration[8.0]
+  def change
+    create_table :users do |t|
+      t.string :name, null: false
+      t.string :email_address, null: false
+      t.string :password_digest, null: false
+
+      t.timestamps
+    end
+    add_index :users, :email_address, unique: true
+  end
+end

db/migrate/20250611155737_create_sessions.rb

@@ -0,0 +1,11 @@
+class CreateSessions < ActiveRecord::Migration[8.0]
+  def change
+    create_table :sessions do |t|
+      t.references :user, null: false, foreign_key: true
+      t.string :ip_address
+      t.string :user_agent
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,35 @@
+# 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.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[8.0].define(version: 2025_06_11_155737) do
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "pg_catalog.plpgsql"
+
+  create_table "sessions", force: :cascade do |t|
+    t.bigint "user_id", null: false
+    t.string "ip_address"
+    t.string "user_agent"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["user_id"], name: "index_sessions_on_user_id"
+  end
+
+  create_table "users", force: :cascade do |t|
+    t.string "email_address", null: false
+    t.string "password_digest", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["email_address"], name: "index_users_on_email_address", unique: true
+  end
+
+  add_foreign_key "sessions", "users"
+end