I'd like to invalidate a set of caches based on user id upon user login. I'd like to avoid creating new tags, and limit new code as much as possible. Presumably the way to do this is with cache tags.
The specific use case is to cache a user-specific web service response, per user, for the duration of a user session.
Are there any existing cache tags (or something to similar effect) which are invalidated upon successful user login, so that I don't have to implement
hook_user_login() to manually invalidate the cache?