completed SMS gateway project

db/migrate/20251020025135_create_admins.rb

@@ -0,0 +1,14 @@
+class CreateAdmins < ActiveRecord::Migration[8.0]
+  def change
+    create_table :admins do |t|
+      t.string :email, null: false
+      t.string :password_digest, null: false
+      t.string :name, null: false
+      t.datetime :last_login_at
+
+      t.timestamps
+    end
+
+    add_index :admins, :email, unique: true
+  end
+end