Add basic storage for validation events

app/models/contact.rb

@@ -16,6 +16,7 @@ class Contact < ApplicationRecord
   has_many :domain_contacts
   has_many :domains, through: :domain_contacts
   has_many :legal_documents, as: :documentable
+  has_many :validation_events, as: :validation_eventable
   has_many :registrant_domains, class_name: 'Domain', foreign_key: 'registrant_id'
   has_many :actions, dependent: :destroy
 

app/models/validation_event.rb

@@ -0,0 +1,9 @@
+class ValidationEvent < ActiveRecord::Base
+  enum event_type: ValidationEvent::EventType::TYPES, _suffix: true
+
+  belongs_to :validation_eventable, polymorphic: true
+
+  def event_type
+    @event_type ||= ValidationEvent::EventType.new(read_attribute(:event_kind))
+  end
+end

app/models/validation_event/event_type.rb

@@ -0,0 +1,10 @@
+class ValidationEvent
+  class EventType
+    TYPES = { email_validation: 'email_validation',
+              manual_force_delete: 'manual_force_delete' }.freeze
+
+    def initialize(event_type)
+      @event_type = event_type
+    end
+  end
+end