Add indexes to the mongo databases?
The database is somewhat big, with 1664598 elements in the `rows` collection.

Note: the `rows` collection will disappear in https://github.com/huggingface/datasets-preview-backend/pull/202, but still: we should keep an eye on the sizes and the performance.
Add indexes to the mongo databases?: The database is somewhat big, with 1664598 elements in the `rows` collection.

Note: the `rows` collection will disappear in https://github.com/huggingface/datasets-preview-backend/pull/202, but still: we should keep an eye on the sizes and the performance.