Add data migration to fill EmailAddressVerifications

db/data/20200608084321_fill_email_verifications.rb

@@ -0,0 +1,19 @@
+class FillEmailVerifications < ActiveRecord::Migration[6.0]
+  def up
+    registrar_billing_emails = Registrar.pluck(:billing_email).uniq.reject(&:blank?)
+    registrar_emails = Registrar.pluck(:email).uniq.reject(&:blank?)
+    contact_emails = Contact.pluck(:email).uniq.reject(&:blank?)
+
+    emails = (contact_emails || registrar_emails || registrar_billing_emails).uniq
+
+    result = emails.map do |email|
+      { email: email, domain: Mail::Address.new(email).domain || 'not_found' }
+    end
+
+    EmailAddressVerification.import result, batch_size: 500
+  end
+
+  def down
+    EmailAddressVerification.delete_all
+  end
+end