List of improvements to discuss
1. When there is no likes (zero) and user clicks on thumb-down (arrow-down) number of likes changes to some randomly generated huge number...
2. When Expire date field is not set, it automatically takes current date. I think it is better to leave this field blank.
3. When trying to make coupon Featured, this state not saved in admin panel.
4. Add image field for DEAL coupon type / make a certain difference for code/deal and other coupon types.