This is a quite interesting topic for us (well for me )
I would like to create a service (or two) which would take InfoTable (from queryPropHistory) as its parameter, and return a trend value.
One service would return only Number, i.e. 0,1,2 for stagnating, rising and falling and second one would return an InfoTable with Slope value i.g.:
"timestamp" : "startDate",
"value" : "1"
"timestamp" : "endDate",
"value" : "2"
So plotted it would return nice little line rising (Slope).
Reason why use TimeSeries data with query is that I could easily choose a time-frame in which is my trend calculated and compare those across (last day, day before, last week, first Wednesday last month and so on)
I marked this Topic as an Question, feel free to comment if you have dealt with this.
I would like to do it today, so If I come up with something I just paste it in.