Remove unused db column

app/models/invoice.rb

@@ -3,7 +3,6 @@ class Invoice < ActiveRecord::Base
   include Concerns::Invoice::Cancellable
   include Concerns::Invoice::Payable
 
-  belongs_to :seller, class_name: 'Registrar'
   belongs_to :buyer, class_name: 'Registrar'
   has_one  :account_activity
   has_many :items, class_name: 'InvoiceItem', dependent: :destroy

app/views/registrar/invoices/index.haml

@@ -57,7 +57,7 @@
             %th{class: 'col-xs-3'}= t(:total)
         %tbody
           - @invoices.each do |invoice|
-            %tr.invoice
+            %tr
               %td= link_to(invoice, [:registrar, invoice])
               - if invoice.paid?
                 %td= l invoice.receipt_date