Creating Your Own Activity Registration in GAE / P

Question

I would like to register user activity in my application for presentation to users, as well as for administrative purposes. My clients are companies, so there are three levels at which I can represent activities:

• Single user activity
• Activities of all users of the company
• All activities

To complete the logging, I would create a model for storing log entries. I see several ways to do this.

At first, I could store each registered activity in my own entity and then query as needed:

class Activity(ndb.Model):
    activity = ndb.StringProperty()
    user_id = ndb.StringProperty()
    company_id = ndb.StringProperty()

Secondly, I could store all user activity in one object:

class UserActivity(ndb.Model):
    activity = ndb.StringProperty(repeated=True) # Note this is now a list
    company_id = ndb.StringProperty()

Thirdly, I could store all the activities of the company in one object:

class CompanyActivity(ndb.Model):
    activity = ndb.StringProperty(repeated=True) # Would store user_id here somehow

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