Python SDK v6.3.0

Added

• list_columns, add_column, update_column, delete_column, reorder_columns, and restore_column on client.datasets (sync and async) — manage a dataset's column schema over the API. List the columns (pass include_removed to include soft-removed ones), add custom columns, rename any column, soft-delete a column (built-in or custom; its data is preserved), reorder columns, and restore a removed column. Adds the DatasetColumn and DatasetColumnSource types and a columns field on Dataset.
• Row writes accept custom column values: client.datasets.insert_rows takes a custom map keyed by column identifier, and DatasetRow now carries a custom field on reads (removed columns are omitted).