As it's possible to to copy queries across widgets (project -> user, user -> project) we need to upgrade aggregated to be able to run a query on aggregated in personal context (not possible today).
The keyword aggregated will have a companion "function" AGGREGATED() that could take a parameter to make it usable elsewhere (AGGREGATED('guinea-pig')). SELF() is added too to make it consistent. Usage of aggregated and self keyword is deprecated (in documentation and in various examples).