ER diagram: https://lucid.app/documents/view/c87b07c7-4522-4d56-a3bd-a33e8aed1554

This application allows online sellers to:

• Register and log in with email, Gmail, or Facebook account
• Create, edit, and delete discount programs for online shoppers
• Get a notification if the program is expired or created successfully
• Track the number of clicks on each promotion and sort the most clicked promotions monthly, quarterly, and yearly
• Export tracking statistics to Excel
• Subscribe to a free or paid account and cancel anytime (the account is still valid until the end of subscription)

• Free: max 25 promotions
• Medium ($5 /month): max 50 promotions
• Premium ( $15/month): Unlimited

Inactive accounts for over 6 months will be temporarily blocked