[Buildbot] #3301: (IntegrityError) insert or update on table "buildsets" violates foreign key constraint "buildsets_sourcestampid_fkey"

[Buildbot trac]

#3301: (IntegrityError) insert or update on table "buildsets" violates foreign key
constraint "buildsets_sourcestampid_fkey"
-------------------+--------------------
Reporter:  Ben     |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.8.x
 Version:  0.8.12  |  Resolution:
Keywords:  db      |
-------------------+--------------------

Comment (by Ben):

 This error happen when multiple Schedulers are busy at the same time
 triggering a build from the same commit. It doesn't matter if the
 triggered builds are on the same builder or not.

 Not all schedulers (that are triggering builds from that same commit) are
 failing. Most of them are working and actually triggers their builds. The
 one that are not working don't trigger any build, and spit this traceback
 in the logs.

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Ticket URL: <http://trac.buildbot.net/ticket/3301#comment:2>
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