CartoDB/torque — pull request #4 by mativs (2013-01-15 21:00:32+00:00)
Title: Cumulative Expire Feature

We were needing the following functionality:

Points appearing for a fixed tiime period. By adding the 'cumulative_expires' and the 'expiration_column' options, we draw the map by adding or subtracting values to that cell according to the starting datetime and the ending datetime.

I've added the cumexpires.html example to show how it works.

Let me know what you think about it.