fix: price-comparison SKU lookup — wrong column refs (so.stock_level, search_url_template)

packages/api/src/routes/price-comparison.ts

@@ -181,10 +181,10 @@ priceComparisonRouter.get("/:sku", async (req: Request, res: Response) => {
         po.price,
         po.currency,
         po.stock_level,
-        -- Prefer stock_observations for latest stock info
+        -- Prefer stock_observations for latest stock info (in_stock is boolean)
         COALESCE(
           (
-            SELECT so.stock_level
+            SELECT CASE WHEN so.in_stock THEN 'in_stock' ELSE 'out_of_stock' END
             FROM stock_observations so
             WHERE so.transceiver_id = po.transceiver_id
               AND so.source_vendor_id = po.source_vendor_id
@@ -193,10 +193,11 @@ priceComparisonRouter.get("/:sku", async (req: Request, res: Response) => {
           ),
           po.stock_level
         )                                        AS stock_level,
-        -- Build product URL: use vendor search_url_template if no direct url
+        -- Use direct product URL from price observation, fall back to vendor shop/website
         COALESCE(
-          v.search_url_template,
-          v.website_url
+          po.url,
+          v.shop_url,
+          v.website
         )                                        AS url,
         po.time                                  AS observed_at
       FROM (
@@ -206,6 +207,7 @@ priceComparisonRouter.get("/:sku", async (req: Request, res: Response) => {
           po.price,
           po.currency,
           po.stock_level,
+          po.url,
           po.time
         FROM price_observations po
         WHERE po.transceiver_id = $1