completed SMS gateway project

db/migrate/20251019070520_create_otp_codes.rb

@@ -0,0 +1,21 @@
+class CreateOtpCodes < ActiveRecord::Migration[8.0]
+  def change
+    create_table :otp_codes do |t|
+      t.string :phone_number, null: false
+      t.string :code, null: false
+      t.string :purpose, default: "authentication"
+      t.datetime :expires_at, null: false
+      t.boolean :verified, default: false
+      t.datetime :verified_at
+      t.integer :attempts, default: 0
+      t.string :ip_address
+      t.jsonb :metadata, default: {}
+
+      t.timestamps
+    end
+
+    add_index :otp_codes, :phone_number
+    add_index :otp_codes, :expires_at
+    add_index :otp_codes, [:phone_number, :verified, :expires_at]
+  end
+end