add BuyCryptoOrder and SellCryptoOrder entities

app/models/concerns/processable.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+module Processable
+  extend Enumerize
+  extend ActiveSupport::Concern
+
+  included do
+    enumerize :status, in: [:processing, :completed, :canceled], default: :processing
+  end
+
+  def processing?
+    status == :processing
+  end
+
+  def completed?
+    status == :completed
+  end
+
+  def canceled?
+    status == :canceled
+  end
+end