[Buildbot] #3383: indexeddb optimizations

[Buildbot trac]

#3383: indexeddb optimizations
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Reporter:  tardyp       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.0
 Version:  master       |   Keywords:
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 For gsoc2015, we made a complex optimization involving indexeddb, and
 cross tab synchronisation, in order to optimize the number of queries
 needed for displaying a UI page.

 We figured out this was actually slowing things down due to several
 unexpected performance contention.
 After investigating for easy way to fix them, we eventually went back and
 reverted all the optimizations. ( 1499f7d revert to midterm dataservice)

 Here is the summary of issues seen, and plan on what should be done in
 order to make proper optimized data service:
 https://docs.google.com/document/d/1VRdY2lqyz0UnbD4kllkzXBDIGDDoxvVgmWjn6M3oK4A/edit?ts=563b583f


 First is to implement the API changes we see are important for the final
 design, and then we have the time to actually implement the optimizations
 (post nine)

 I keep it for 0.9.0 milestone for the API change, but we can still put it
 for 0.9.0+ as those are just API changes that can be impleented with
 $watch.

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Ticket URL: <http://trac.buildbot.net/ticket/3383>
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