Steve Howell 0e56fecbd9 peformance: Avoid broad StreamCount queries. ...

Our get_streams_traffic function used to query
all streams in the StreamCount table if you
passed in `None` for `streams`.

Now we require that you pass in a list of
stream_ids.

I don't know how much work this will save
the database, since probably the bulk of
the work is aggregating.  If we need to fine
tune DB performance, we could possibly add
`realm` as an argument and add it to the filter.

What we'll immediately get, for large multi-realm
installations, is less data over the wire and
less work for the ORM.

2018-08-17 08:14:42 -07:00

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