add admin user by devise

db/migrate/20210803222524_devise_create_admin_users.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+class DeviseCreateAdminUsers < ActiveRecord::Migration[6.1]
+  def change
+    create_table(:admin_users) do |t|
+      ## Database authenticatable
+      t.string(:email,              null: false, default: "")
+      t.string(:encrypted_password, null: false, default: "")
+
+      ## Recoverable
+      t.string(:reset_password_token)
+      t.datetime(:reset_password_sent_at)
+
+      ## Rememberable
+      t.datetime(:remember_created_at)
+
+      ## Trackable
+      # t.integer  :sign_in_count, default: 0, null: false
+      # t.datetime :current_sign_in_at
+      # t.datetime :last_sign_in_at
+      # t.string   :current_sign_in_ip
+      # t.string   :last_sign_in_ip
+
+      ## Confirmable
+      # t.string   :confirmation_token
+      # t.datetime :confirmed_at
+      # t.datetime :confirmation_sent_at
+      # t.string   :unconfirmed_email # Only if using reconfirmable
+
+      ## Lockable
+      # t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
+      # t.string   :unlock_token # Only if unlock strategy is :email or :both
+      # t.datetime :locked_at
+
+      t.timestamps(null: false)
+    end
+
+    add_index(:admin_users, :email,                unique: true)
+    add_index(:admin_users, :reset_password_token, unique: true)
+    # add_index :admin_users, :confirmation_token,   unique: true
+    # add_index :admin_users, :unlock_token,         unique: true
+  end
+end