Currently, extract_date_range() assumes that the data is grouped at a weekly level, but this is not necessarily the case.

It would be good if it computes whether the date is grouped at a daily, weekly, or monthly level, perhaps by taking into account the differences of the dates.

The "text" return could then be something like:

• Daily data from X to X
• Weekly data from X to X

When introducing this feature, it would be good to test whether this has an impact on the performance of functions which use extract_date_range().