Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> Me either. I think this might call for too much invention so I'm going
> to revert to plan A. The invalidation code won't be very much, and it
> should be a fairly rare event, so it doesn't need to be very clever.
The problem with rarely-executed code is that it's also hard to test.
regards, tom lane