Locking bugs temporarily?

[Gervase Markham]

I have an extension which integrates Bugzilla with another system. At
the moment, it's possible for me to get a Bug object and, while I am
working out how to change it as part of the sync, for someone else to
update the bug. My changes then overwrite theirs. Obviously, there's a
fairly small time window, but occurrences of this have been noted.

I can't really implement conflict resolution logic - that needs a human.
So I'd really like to lock the bug when I get a copy, make my update
e.g. 2 seconds later, unlock it, for their change to then try and be
committed and for _them_ (the human) to get a mid-air that they can
resolve however they like.

Is it possible to temporarily lock a bug? Either within Bugzilla or
using a direct database command on a table row? Would that screw things
up? Is there a better way of solving this?

We are using MySQL and, at the moment, Bugzilla 3.6.

Thanks,

Gerv
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