The caller's v1 supply chains that are not removed, active ones only unless filter sets isArchived to 1 (legacy answered a 500 for it). q matches the name, productId narrows to the chain the product is on, and filter is a JSON object whose name matches as a case-insensitive substring. Sortable by name, isArchived and updatedAt. isDropDown=true returns every match in one page. Answers the paginated { data, metadata: { pagination } } envelope (1-based pagination.page); legacy sent { data, meta }.