Well, how accurate does the sensor read out need to be? Is this for heart surgery or a battlebot? If absolute precision isn't necessary, I would just collect samples and save the averages - ie: every 5 seconds as opposed to every second.
Plus, each row in a mysql db doesn't require very much memory. Having only 1 byte per row is perfectly fine, as long as you don't exceed 2,147,483,647 entries...
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