You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20130121041654_remove_unsused_events.rb
    path of file: ./repos/Autolab/db/migrate
    
    the code of the file until where you have to start completion: class RemoveUnsusedEvents < ActiveRecord::Migration[4.2]
  def self.up
    drop_table :event_categories
    drop_table :event_exceptions
    drop_table :event_informations
    drop_table :event_schemas
    drop_table :event_specifications
    drop_table :events
  end

  def self.down
    create_table "event_categories" do |t|
      t.string  "name"
      t.integer "course_id"
    end

    create_table "event_exceptions" do |t|
      t.integer  "event_specification_id"
      t.string   "action",                 :null => false
      t.integer  "instructor_id"
      t.datetime "start_time",             :null => false
      t.datetime "end_time"
      t.string   "location"
      t.string   "title"
      t.datetime "original_start_date"
    end

    create_table "event_informations" do |t|
      t.integer "event_schema_id",      :null => false
      t.date    "date",                 :null => false
      t.integer "acting_instructor_id"
      t.text    "description"
      t.string  "title"
    end

    create_table "event_schemas" do |t|
      t.integer "category_id"
      t.integer "cou
    
  def self.down
    create_table "event_categories" do |t|
      t.string  "name"
      t.integer "course_id"
    end

    create_table "event_exceptions" do |t|
      t.integer  "event_specification_id"
      t.string   "action",                 :null => false
      t.integer  "instructor_id"
      t.datetime "start_time",             :null => false
      t.datetime "end_time"
      t.string   "location"
      t.string   "title"
      t.datetime "original_start_date"
    end

    create_table "event_informations" do |t|
      t.integer "event_schema_id",      :null => false
      t.date    "date",                 :null => false
      t.integer "acting_instructor_id"
      t.text    "description"
      t.string  "title"
    end

    create_table "event_schemas" do |t|
      t.integer "category_id"
      t.integer "course_id"
      t.string  "title",                          :null => false
      t.boolean "monday",      :default => false
      t.boolean "tuesday",     :default => false
      t.boolean "wednesday",   :default => false
      t.boolean "thursday",    :default => false
      t.boolean "friday",      :default => false
      t.boolean "saturday",    :default => false
      t.boolean "sunday",      :default => false
    end

    create_table "event_specifications" do |t|
      t.integer "event_schema_id"
      t.integer "instructor_id"
      t.time    "start_time",                      :null => false
      t.time    "end_time",                        :null => false
      t.string  "location",                        :null => false
      t.string  "title",           :default => ""
    end

    create_table "events" do |t|
      t.string   "name"
      t.text     "description"
      t.datetime "date"
      t.boolean  "private"
      t.integer  "course_id"
      t.datetime "created_at"
      t.datetime "updated_at"
      t.integer  "category_id"
    end
  end