Single-query _fast_time_series. 
Single-query _fast_time_series. 

It is DB-specific because of http://code.djangoproject.com/ticket/10302 .

The plan is to integrate _fast_time_series into time_series and to fall-back to 
old behaviour (N queries for N points) if single-query version is not available 
or not implemented.
kmike/django-qsstats-magic,heyandie/django-qsstats-magic