Bookmarking Issues

Hi guys, I just started using Sentry a few days ago and I am currently on the free-tier. I’m aware that events are only kept for 30 days and I’m wondering if bookmarking circumvents this? What does bookmarking actually do? I even got a warning that bookmarking can’t be undone which is weird to me.

Also, is there a way for me to export events into maybe a CSV? I know I can grab the JSON files but a CSV is better at importing into a spreadsheet for example.