This will be hugely beneficial to clients to know how far back each data goes when pulling historics. I get some clients reach out on intercom asking about this and specific data sources (like Tiktok , but i know we cannot add this in the library). A button similar to the Historic Guide button which takes you to the below article would be amazing:
https://intercom.help/pulsar/en/articles/568543-trac-historical-data-availability-on-trac