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: helpers.rb
    path of file: ./repos/discourse/lib/migration
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Migration
  module Helpers
    def self.site_created_at
      result = DB.query_single <<~SQL
        SELECT created_at
 
    
    def self.site_created_at
      result = DB.query_single <<~SQL
        SELECT created_at
        FROM schema_migration_details
        ORDER BY created_at
        LIMIT 1
      SQL
      result.first
    end