Delete Dataset Rows

Delete specific rows from a dataset, creating a new version.

Supports two modes: index-based (row_indices) for backwards compatibility and fingerprint-based (fingerprints) for safe deletion that is immune to dataset mutations between analysis and delete.

Args: name: Dataset name. version: Version number (use "latest" for most recent). request: Exactly one of row_indices or fingerprints.

Returns: DatasetRowsDeleteResponse with deletion status and new version.

Raises: HTTPException: 400 if identifiers are invalid, 404 if not found.