[Buildbot] #3105: Implement logchunk compression

[Buildbot trac]

#3105: Implement logchunk compression
------------------------+-------------------
Reporter:  Ben          |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.0
 Version:  master       |   Keywords:  db
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 Looks like we will need that one sooner that we thought, The nine.b.n
 instance already has a sqlite db of 400MB ... and is not running for one
 month ...

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Ticket URL: <http://trac.buildbot.net/ticket/3105>
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