subtract debits from cake balance

app/models/application_record.rb

@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
+
+  default_scope { order(created_at: :desc) }
 end

app/models/stake_order.rb

@@ -33,6 +33,9 @@ class StakeOrder < ApplicationRecord
     super & ["pool_name", "amount"]
   end
 
+  scope :add, -> { where("amount > 0") }
+  scope :remove, -> { where("amount < 0") }
+
   private
 
   def notification_message

app/models/user.rb

@@ -29,6 +29,7 @@ class User < ApplicationRecord
 
   has_many :documents, class_name: "UserDocument", dependent: :destroy
   has_many :stake_orders, dependent: :restrict_with_error
+  has_many :sell_crypto_orders, dependent: :restrict_with_error
   has_one :fiat_balance, dependent: :restrict_with_error
 
   validates :first_name, :last_name, :email, presence: true