Remove boolean erase column from ci build and foreign key

app/models/ci/build.rb

@@ -31,7 +31,6 @@
 #  artifacts_file     :text
 #  gl_project_id      :integer
 #  artifacts_metadata :text
-#  erased             :boolean          default(FALSE)
 #  erased_by_id       :integer
 #  erased_at          :datetime
 #

app/models/ci/build/eraseable.rb

@@ -35,7 +35,6 @@ module Ci
       def update_erased!(user = nil)
         self.erased_by = user if user
         self.erased_at = Time.now
-        self.erased = true
         self.save!
       end
     end

db/migrate/20160202091601_add_eraseable_to_ci_build.rb

 class AddEraseableToCiBuild < ActiveRecord::Migration
   def change
-    add_column :ci_builds, :erased, :boolean, default: false
     add_reference :ci_builds, :erased_by, references: :users, index: true
-    add_foreign_key :ci_builds, :users, column: :erased_by_id
     add_column :ci_builds, :erased_at, :datetime
   end
 end

db/schema.rb

@@ -129,7 +129,6 @@ ActiveRecord::Schema.define(version: 20160209130428) do
     t.text     "artifacts_file"
     t.integer  "gl_project_id"
     t.text     "artifacts_metadata"
-    t.boolean  "erased",             default: false
     t.integer  "erased_by_id"
     t.datetime "erased_at"
   end
@@ -923,5 +922,4 @@ ActiveRecord::Schema.define(version: 20160209130428) do
   add_index "web_hooks", ["created_at", "id"], name: "index_web_hooks_on_created_at_and_id", using: :btree
   add_index "web_hooks", ["project_id"], name: "index_web_hooks_on_project_id", using: :btree
-  add_foreign_key "ci_builds", "users", column: "erased_by_id"
 end