We're doing contact tracing over here (even though we've had pretty much no community transmission the entire time), where every time you go to a public place where a lot of people can gather you have to sign in either with an app on your phone or by writing your name and phone number (and possibly address, I can't remember as I use the app). The information is (supposedly) only kept for a week or two. If someone is suspected of having been exposed or contracted covid, the contact tracing information is used to find out where that person has been and everyone else that has been in the same area at the same time is then contacted so they know to go get tested, which also lets you know where you picked it up from.