I'm working on adding a ticket change listener to the TracPM plugin so
that schedules are continuously updated.  On an ongoing basis, I find
that changing one ticket changes dozens or even a hundred others and
that can be done in "UI time".  But the very first time a ticket
change is made after the rescheduler is enabled, *every* ticket in the
system needs to be updated.

I'm not yet 100% sure that I don't have a performance bottleneck in my
code but it occurs to me that it would be nice to do the initial
scheduling outside the ticket change listener.  I know some plugins
hook into Trac in a way that when they are first activated a database
upgrade is required and I assume I could do my initial scheduling in
such an upgrade script.  But I don't know where that hook is.  I found
http://trac.edgewall.org/wiki/TracDev/DatabaseUpgrades but that
doesn't seem to be right.

Can someone point me at an example?  Thanks.


        Chris
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A: Top-posting.
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