Analytics data-purge is spread over multiple jobs with different running ways (1 timer per dataset, or multiple datasets through a single timer).
I suggest creating a script that would gather data to clean through configuration making it easier to maintain (1 single point of config for all data-purges). This script could be run at different time intervals (parameter of time-interval for the script to know which data to work), and would take advantage of the different purging strategies we already have solutions for (time-partition as in webrequest, snapshot, hive or not).