🏷️ Handle Coupons and Discount Codes

I gave out discount codes two years ago and I think some are still working. Build me a discount code app. Each code has the code itself, a description, the discount as a percentage or fixed amount, which plans it applies to, whether it is for new customers only, how long the discount lasts such as first month, first year or forever, a total usage limit, a per-customer limit, a start date and a mandatory expiry date. Record every redemption with the customer, the date and the amount discounted. Report per code: redemptions, total revenue given away, and how many of those customers are still active, since discounted customers often churn faster. Add an AI agent that reviews active codes and flags any still running long after their campaign, any with no expiry pressure, and any whose customers retain noticeably worse than average. Automate two things: an alert before a code expires so I can decide deliberately, and a scheduled monthly report of discount given by code. Two logins: an owner who creates codes, and a support user who can apply an existing code but not create one.