A node or edge type whose schema would read back as another type from its JSON form (timestamp units and time zones, durations, times, dictionaries) is refused before a request carries it. Inserting into a property graph registers DataFrame converters first, as Table.add does, and the async graph handles are in the API reference.
Each kind has its own create, open, describe, list and drop. Python create and open return handles: PropertyGraph.insert and rollback, and MaterializedVirtualPropertyGraph.refresh.
A property graph definition now carries its mode. Independent graphs are defined by node and edge types with Arrow schemas and take rows through insert_into_property_graph; materialized view graphs are defined over tables as before and brought up to them with refresh_property_graph. rollback_property_graph returns either to its previous commit, and descriptions report the mode and the current and previous commits.
Jack Ye