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Deletes clips from this archive. The clips are specified as a set of detectors, a set of station/mic pairs, a classification, and a range of dates. All data associated with the clips, including their audio files and annotations, are deleted. You can optionally specify a number of clips to retain. The retained clips are selected at random from those specified, with all clips equally likely to be retained. The deletion runs as a Vesper job. This operation cannot be undone, so be careful!