pytables - more meandering

I've been playing with pytables the last couple of days. I like it a lot for its great efficiency. I was pretty disturbed when my sqlite file was 60+MB. It forces me into a hierarchical format though and I'm not sure how I feel about that. This is a situation where it really might be OK. Laps and tracks really below to a particular run. On the other hand, I could probably easily solve the sqlite inefficiency by storing the sample data as (possibly compressed) blobs.