Support "maxDays: -1" to disable deleting old cache entries
See https://github.com/huggingface/datasets-server/pull/2060#pullrequestreview-1714775842 for reference.
Support "maxDays: -1" to disable deleting old cache entries: See https://github.com/huggingface/datasets-server/pull/2060#pullrequestreview-1714775842 for reference.