I actually log three things when a timer gets cast relative to target information: targetname, targetlevel, and a unique counter which gets bumped each time the target changes. The purpose is such that when the current target dies, it could remove all timers with the same unique ID. Again, it doesn't work if someone switches targets and tabs back to the previous target but it tries to get rid of the ones it's confident it can delete. At least that's the intent. That's why I added support to explicitly delete obsolete timers. I don't currently scan target debuffs to see if a timer got bumped/dispelled/removed but I am looking more and more at having target debuff scanning in the near future.