Completely remove old hints connected to the execution environment

db/migrate/20181127160857_drop_hints.rb

@@ -0,0 +1,5 @@
+class DropHints < ActiveRecord::Migration[5.2]
+  def change
+    drop_table :hints
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_11_26_163428) do
+ActiveRecord::Schema.define(version: 2018_11_27_160857) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -223,16 +223,6 @@ ActiveRecord::Schema.define(version: 2018_11_26_163428) do
     t.index ["context_id", "context_type"], name: "index_files_on_context_id_and_context_type"
   end
 
-  create_table "hints", force: :cascade do |t|
-    t.integer "execution_environment_id"
-    t.string "locale", limit: 255
-    t.text "message"
-    t.string "name", limit: 255
-    t.string "regular_expression", limit: 255
-    t.datetime "created_at"
-    t.datetime "updated_at"
-  end
-
   create_table "internal_users", force: :cascade do |t|
     t.integer "consumer_id"
     t.string "email", limit: 255

db/seeds/development.rb

@@ -19,8 +19,5 @@ CodeOcean::Error.create_factories
 # file types
 FileType.create_factories
 
-# hints
-Hint.create_factories
-
 # submissions
 FactoryBot.create(:submission, exercise: @exercises[:fibonacci])

db/seeds/production.rb

@@ -25,9 +25,6 @@ Exercise.create_factories
 # file types
 FileType.create_factories
 
-# hints
-Hint.create_factories
-
 # change all resources' author
 [ExecutionEnvironment, Exercise, FileType].each do |model|
   model.update_all(user_id: InternalUser.first.id)