fix(stock): rollback before marking Stock Closing Entry failed (Postgres)

prepare_closing_stock_balance (background job) saves Stock Closing Balance rows + db_set status; on failure the except runs db_set('Failed')+log_error with no rollback, raising InFailedSqlTransaction on Postgres so the doc is never marked Failed and the job dies. Full frappe.db.rollback() before the handler's db_set. No-op on MariaDB.

erpnext/stock/doctype/stock_closing_entry/stock_closing_entry.py

@@ -152,6 +152,7 @@ def prepare_closing_stock_balance(name):
 		doc.create_stock_closing_balance_entries()
 		doc.db_set("status", "Completed")
 	except Exception:
+		frappe.db.rollback()
 		doc.db_set("status", "Failed")
 		doc.log_error(title="Stock Closing Entry Failed")