Paginated list of classification data fields as { id, title, entity, description }. Sortable by id/title/description/entity/createdAt/updatedAt (default: id ascending), filterable with filter={"title"|"description"|"entity":"…"} (case-insensitive substring). isDropDown=true answers every matching row on one page. Legacy also answered the JSON API templates, timestamps and data type of each field, and accepted an exact-match entity param, an entityProperty sort and an unused fields. Answers the paginated { data, metadata: { pagination } } envelope (1-based pagination.page); legacy sent { data, meta }.