Since there is no concurrency in contact tracing (only you will manipulate your own data), a CRDT might be an unnecessary overhead. The German Corona-Warn-App is a decentralized approach for contact tracing. It's awesome, you should check it out: https://github.com/corona-warn-app
There is concurrency in contact tracing. In developing nations it’s like a map reduce problem. You send out the contact tracers in the morning, they gather results and sync up at the end of the day.
Being able to sync better through the day means reducing multiple checks on families, adds in new contacts that could be checked by others nearby. Stuff like that.
Thanks for sharing this app. I haven’t seen any data showing these user run apps are useful. Even if they got enough users to run them, the noise is so high to actually do anything with the results.
Although I’m optimistic that someone will figure it out and publish some papers on it.
