I agree with just removing it from the spec quietly. We can discuss later whether “AT TIME” is needed or not, and define it properly for a future version.
This status is still ‘analysis', although there were several topics on this on discourse. If the change is only the one the PR then I’m ok with it - we can always refine it later (in v1.1).
Improve documentation of SELECT, FROM, WHERE etc with reference to SQL and any other relevant material.