5ea71beeb1
We're seeing slow commits on production for courseware_studentmodule updates. Based on the slow queries during those times, we think it might be because multiple worker processes are trying to update the same rows from within long-running transactions (since courseware is relatively slow). The risk with this is that since the whole view execution is no longer wrapped in a big implicit transaction, it's possible that XBlock state will update and things that key off of that (e.g. completion progress information or pre-req milestones) will fail in a way that will leave the database in an unplanned-for state, though this is already the case for those actions that trigger asynchronous tasks like grades recalculation. The query counts for the index view test were adjusted down because save points count towards the total and we're no longer setting them at the top level around the view as a whole.
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