title: Magento Cronjob for updating stock
body: <p>after a long search I've finally decided to ask:</p>
  
  <p>I need a Cronjob for magento that updates the product attribute "<strong>stock</strong>" in "on stock" once a day.</p>
  
  <p>Is there a possibility to catch this attribute and change it with a cronjob?</p>
  
  <p>Thank you</p>