internal package Foswiki::Plugins::CaptchaPlugin::Store class to manage the captcha
ClassMethod new() → $store constructor for a store object
ObjectMethod writeDebug($message) prints debug $message to STDERR
ObjectMethod readCaptcha($challenge) reads the store and creates a Captcha object for it
ObjectMethod writeCaptcha($captcha) takes a Captcha object and saves it into the store
ObjectMethod removeCaptcha($captcha) deletes the store for the given captcha object
ObjectMethod lockDB($mode) locking for the captcha store
ObjectMethod unlockDB() unlocks the store
ObjectMethod expire() expires objects stored in the database