allows unfeasible emails only to be send out once

db/migrate/20160328152843_add_unfeasible_email_sent_at_to_spending_proposals.rb

@@ -0,0 +1,5 @@
+class AddUnfeasibleEmailSentAtToSpendingProposals < ActiveRecord::Migration
+  def change
+    add_column :spending_proposals, :unfeasible_email_sent_at, :datetime, default: nil
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160315092854) do
+ActiveRecord::Schema.define(version: 20160328152843) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -311,6 +311,7 @@ ActiveRecord::Schema.define(version: 20160315092854) do
     t.integer  "valuation_assignments_count",           default: 0
     t.integer  "price_first_year",            limit: 8
     t.string   "time_scope"
+    t.datetime "unfeasible_email_sent_at"
   end
 
   add_index "spending_proposals", ["author_id"], name: "index_spending_proposals_on_author_id", using: :btree