Promo & Discount Calendar Guard: Stop Stacked Sales and Margin-Killing Prices

The problem this kills

You run a flash sale on a collection. What you forget is that the same products are already in an evergreen "20% off clearance" bucket — so customers stack both, and you quietly sell at half price. Or a well-meaning teammate sets a 40% holiday discount on an item whose margin only ever had 30% to give, and every unit sold loses money. Nobody notices until the finance review weeks later, when the damage is already booked.

Promo overlaps and below-floor prices are some of the easiest money to give away by accident, because a busy calendar is impossible to hold in your head. Two people plan two campaigns, both touch the same SKU, and the math that says "this combination loses money" never gets done — until it's too late. The clues are all sitting right there in your promo plan and your cost list. You just need something that does the overlap check and the margin math on every promo before it goes live. You do not need to be a developer to build that something.

What you'll build

A simple internal web tool for your marketing ops team. You import two files: your planned promos (offer name, products or collections, discount %, channel, dates) and your product cost/price list. The tool checks every promo two ways: does it overlap another active promo on the same SKU or segment (including the sneaky "evergreen + flash" combination), and does the discounted price break your approved margin floor? It computes the resulting unit margin from cost and discount, flags every violation with the math shown in plain English, and holds it. Your promo manager reviews each flagged promo and clicks Approve or Reject. Only approved promos land on the live calendar — and the tool exports them as a promo-import CSV in the exact columns your storefront or promo engine expects.

What's inside the Implementation Plan

The downloadable plan is a step-by-step file you paste into an AI coding agent. It opens by interviewing you about your business — how you plan promos today, the systems and spreadsheets you use, the exact columns and naming in your promo and cost data, how you identify products (SKU, collection, segment), your typical and peak promo volumes, your real margin-floor rule, and the messy edge cases like clearance buckets and bundles. It reads a short spec back to you for a thumbs-up, then builds the tool around your answers instead of a generic template. From there it walks the agent through the data model, the CSV imports, the overlap detector, the margin-floor math engine, the review-and-decide screen, the human approval gate, and the approved-promos export. Every step ends with a ready-to-copy prompt.

The governance it includes (this is the point)

This isn't a toy. The plan builds in the controls a real marketing function needs: login so only your team can use it, row-level security so people only see their own organization's promos, a complete audit trail of every approve/reject decision and override (who, what, when, and why), a hard human-approval gate so nothing reaches the live calendar until a person reviews the math, and duplicate guards so the same promo can't be entered or processed twice. The whole tool exists to make a careful human decision easy — the AI does the overlap and margin math, a person makes the call.

Who it's for

Ecommerce and retail marketing ops leads and promo managers who run frequent sales and have, at least once, double-discounted by accident or watched a campaign sell below cost. If you can describe what makes two promos "overlap" and what your margin floor is, you can build this.

You've got this — open the plan, paste the first prompt, and you'll be catching your first stacked-discount and below-floor promos this weekend.