[Sparrow]

Interesting Darth, however it's questionable if storing the data in a database is necessary at all. If you intend to generate statistical studies with secondary tools from the data it should be in a format that is widely used. The only thing you'd need to worry about is bringing it into the right format (5min/monthly/etc.)
In case you want to write your own studies, a database makes sense, otherwise text files are more efficient which you might choose to compress or not.

It could also be better to just purchase the data and save yourself all the hassle.