Add model for BankGateway

app/models/bank_account.rb

@@ -1,5 +1,6 @@
 class BankAccount < ApplicationRecord
   has_many :bank_transactions, dependent: :destroy
+  belongs_to :bank_gateway, optional: true
 
   normalize_attributes :name, :iban, :description
 

app/models/bank_gateway.rb

@@ -0,0 +1,8 @@
+class BankGateway < ApplicationRecord
+  has_many :bank_accounts, dependent: :nullify
+  belongs_to :unattended_user, class_name: 'User', optional: true
+
+  scope :with_unattended_support, -> { where.not(unattended_user: nil) }
+
+  validates_presence_of :name, :url
+end