buildbot console errors out if left in an open tab for too long

[catamorphism]

At least for me, if I leave a buildbot console open in a tab, eventually it stops refreshing and then instead i get "web.Server Traceback (most recent call last): exceptions.KeyError: 594" with a Python backtrace. I can paste the backtrace if it's useful, but I suspect it's reproducible just by leaving the tab open for an hour or so.

[graydon]

Yeah. I am vaguely hopeful that when I upgrade buildbot to 0.8.7 or later (as I'm hoping to for various other branch-logic issues) this might improve. Otherwise ... I certainly see it too, but haven't diagnosed yet.

[emberian]

This is old and I haven't seen this reproducible.