fix on shelf

main.go

@@ -102,6 +102,29 @@ func main() {
 		log.Fatal("could not backfill productlocations.publishedat:", err)
 	}
 
+	// The catalogue's own stable key for an imported product.
+	//
+	// `catalogueid` was never able to be this. The catalogue is rebuilt by
+	// scrape and renumbered every time — pepsico's live ids run 3, 6, 9 … 27,
+	// 30 — so a product imported when it was id 26 now points at nothing.
+	// Measured 2026-08-31: eleven of the nineteen links on the platform were
+	// dangling, which silently breaks three things (the "already imported"
+	// ticks, re-importing, and dedupe on the next scrape).
+	//
+	// Additive and nullable: every existing row keeps working, and a re-import
+	// or `/relinkcatalogue` is how one acquires the key.
+	if err := db.DB.Exec(
+		`ALTER TABLE products ADD COLUMN IF NOT EXISTS imageid text`).Error; err != nil {
+		log.Fatal("could not add products.imageid:", err)
+	}
+	// Not unique: two tenants legitimately stock the same catalogue product,
+	// and each keeps its own snapshot row. The lookup is always per tenant.
+	if err := db.DB.Exec(
+		`CREATE INDEX IF NOT EXISTS products_tenant_imageid_idx
+		 ON products (tenantid, imageid)`).Error; err != nil {
+		log.Println("⚠️  could not add products.imageid index:", err)
+	}
+
 	// Receipts for spreadsheets sent to the catalogue ingest service.
 	//
 	// The ingest service holds a drop on its own terms: an unreviewed one is