# Dev Log: Show SKU in Confirmed Buys & Tracking UI Fixes

**Date:** 2026-05-31
**Task:** Show SKU as a display column on the Confirmed Buys tab & implement small UI fixes.

## Overview
The primary goal of this task was to introduce the `SKU` column into the Confirmed Buys tab, leveraging the new schema (`confirmed_buy_units` table) defined in `Confirmed_Buys_Build_Spec.md`. Additionally, three minor fixes were required:
1. Handle currency-formatted strings being passed into the frontend for `recommended_list_price` resulting in `NaN`.
2. Refresh the Confirmed Buys table automatically upon confirming a purchase in the "Potential Buys" tab.
3. Update the misleading "Confirm & Move to Inventory" button text to "Confirm Purchase" in the Confirm modal.

## Challenges Faced
- **1-to-Many Relationship Mapping:** A confirmed buy can have multiple child SKUs in the `confirmed_buy_units` table, but the v1 specification assumes a single-unit case per UI row. Joining them directly without grouping would cause row duplication in the Confirmed Buys table.
- **Frontend Bug (Hyperlink Hallucination):** During the initial implementation, an attempt was made to turn the SKU text into a deep link to Amazon Seller Central. A nonexistent `skuSearchUrl` helper function was called inside the table rendering logic (`templates/tracking.html`). This caused a `ReferenceError` during `forEach` iteration, preventing the entire table from rendering.
- **Currency Data Formats:** The backend passed `deals.List_at` directly, but the API occasionally ingested it as a formatted currency string (e.g., `"$37.92"`). The frontend's `parseFloat` was failing to parse this, leaving the "Actual List Price" input empty on affected rows.

## Solutions Implemented
- **SKU Data Fetching:** Updated the `GET /api/tracking/confirmed` SQL query in `wsgi_handler.py`. To solve the 1-to-many challenge safely, a `LEFT JOIN` was used in conjunction with a subquery (`SELECT confirmed_buy_id, MIN(sku) as sku FROM confirmed_buy_units GROUP BY confirmed_buy_id`) to extract exactly one representative SKU per confirmed buy row.
- **SKU UI Rendering:** Reverted the attempt to turn the SKU into a hyperlink. The SKU is now rendered as plain text in a read-only state. Added filtering logic in the frontend `fetchConfirmed()` JS function to allow searching by SKU.
- **List Price Parsing:** Wrapped the derivation of `recommended_list_price` in `wsgi_handler.py` with the pre-existing `_parse_currency_to_float()` utility function, ensuring a valid float is always provided to the frontend.
- **Confirm Modal Fixes:** 
  - Added `fetchConfirmed()` to the promise success handler of the Confirm modal (`document.getElementById('confirm-form').onsubmit`) so the Confirmed Buys table refreshes immediately.
  - Updated the button label from "Confirm & Move to Inventory" to "Confirm Purchase" in `tracking.html`.

## Success Status
**Success.** All tasks were completed and verified using Playwright snapshot testing to ensure the UI successfully renders without errors and all backend metrics compute gracefully.