Allow deletion of financial transactions

db/migrate/20181201000200_add_deleted_to_financial_transaction_type.rb

@@ -0,0 +1,8 @@
+class AddDeletedToFinancialTransactionType < ActiveRecord::Migration
+  def change
+    change_table :financial_transactions do |t|
+      t.integer :reverts_id
+      t.index :reverts_id, unique: true
+    end
+  end
+end