Reconcile offer_id after every import

After each single or batch import, walk all catalog items under the
Imported Furniture tree and set offer_id to the furnidata sprite id,
repairing any stale values (e.g. legacy -1 rows). Reports how many
rows were fixed in the API response.

src/lib/services/furni-import.ts

@@ -284,6 +284,25 @@ export function resetCatalogPageCache(): void {
 	categoryCacheTimestamp = 0;
 }
 
+/**
+ * Walk every catalog item under the "Imported Furniture" tree and make its
+ * offer_id match the furnidata sprite id (item_ids). Fixes any stale values
+ * (e.g. legacy -1 rows) after an import.
+ */
+export async function reconcileImportedOfferIds(): Promise<{
+	fixed: number;
+}> {
+	const parentId = await getOrCreateImportedParentPage();
+	const [result] = (await db.execute(sql`
+    UPDATE catalog_items ci
+    JOIN catalog_pages cp ON cp.id = ci.page_id
+    SET ci.offer_id = CAST(ci.item_ids AS UNSIGNED)
+    WHERE cp.parent_id = ${parentId}
+      AND ci.offer_id <> CAST(ci.item_ids AS UNSIGNED)
+  `)) as unknown as [Record<string, unknown>, unknown];
+	return { fixed: Number(result.affectedRows ?? 0) };
+}
+
 /**
  * Allocate the next `catalog_items.id` and run the INSERT through a
  * process-level async mutex so concurrent imports in the same Node process