fix: Add index to Item route

Increases route resolve time if there are lots of Items.

erpnext/stock/doctype/item/item.py

@@ -1062,3 +1062,7 @@ def update_variants(variants, template, publish_progress=True):
 		count+=1
 		if publish_progress:
 				frappe.publish_progress(count*100/len(variants), title = _("Updating Variants..."))
+
+def on_doctype_update():
+	# since route is a Text column, it needs a length for indexing
+	frappe.db.add_index("Item", ["route(500)"])