Correct, there is only one vector of times to label the rows of a timetable. But that's not to say you can't put both vectors in a timetable, just that only one of them can be the "row times". Just add the other one as an ordinary timetable variable, on the same footing as T_Trades.
The row times in a table are special because those are the ones used for subscripting by time. I can't say which of your two vectors is the more "fundamental" one, or which one should be the row times. Maybe neither one is more fundamental, so maybe you want a table (not a timetable) two of whose variables are datetime vectors. But I would think you'd want to make a timetable and choose one of the two as your row times.
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