absolutely agree with the risk of slow clients saturating your connection limit when doing DB work with these, I'm a little shakier -- once I start a multistep

absolutely agree with the risk of slow clients saturating your connection limit when doing DB work with these, I'm a little shakier -- once I start a multistep DB write, I probably want it to finish. Yes I can use a transaction to roll back the whole thing, but I think there are cases where rollback is wrong and I'd rather keep the write. so while cancellation is cool, it's also a little fraught and hard to test.