Counting things by date/time

[Michael Malloy]

I'm a complete newbie to FlockDB

I was wondering if I can do the following

When a person purchases a cell phone from an online store, create an edge between the product (the actual cell phone) and its category (electronics)

Then, query for what people have purchased 3 or more electronics in the past year, past month, past 2 weeks.  Do I need a new edge between electronics and the user every time a purchase is made?  How would I make it extensible so that I could choose arbitrary time periods?