Creating your own activity logging in GAE/P

Question

I\'d like to log user activity in my app for presentation to users and also for administrative purposes. My customers are companies so there are three levels at which I may

Answer 1

I would also suggest the first approach but with KeyProperty:

class Activity(ndb.Model):
    activity = ndb.StringProperty()
    user_id = ndb.KeyProperty(kind='User')
    company_id = ndb.KeyProperty(kind='Company')

Code would be much cleaner from the start and you can always fine-tune later.

For the rest Dan has covered most important points really well.