[Buildbot] #3121: Master deactivation iterates over all builds

[Buildbot trac]

#3121: Master deactivation iterates over all builds
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Reporter:  dustin  |      Owner:
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  0.9.+
 Version:  0.8.10  |   Keywords:  database, simple
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 When a master is deactivated, it performs a query for all builds on that
 master, and marks them as RETRY.  However, that query is not optimized
 down to the DB level, so in practice we select *all* builds, ever, into a
 Python list and then filter that in Python.  That's very inefficient!

 The fix is to trace the 'masterid' and 'results' parameters through the
 data API endpoint and into the DB API.

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Ticket URL: <http://trac.buildbot.net/ticket/3121>
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