This is where I'd point you to my data warehouse idea... http://thwack.solarwinds.com/ideas/2637
Since the historical data will be used for reporting and statistical analysis, it is best to move it off of the production database.
Hopefully we can get Solarwinds to take this idea and run with it.
In the meantime, if you don't have performance issues, then I wouldn't be too concerned but I would keep an eye on things.