OK, I misunderstood thinking "Date:Time" was the literal key name. So you want the keys to be the actual date/time and you want to the number of keys to grow. Remember that the larger the INI file the longer it will take to process and so the greater the possibility of contention. If you give each user their own INI that should not be a problem.
I was assuming you had a back-end that collected the data from the INI into a db. The longer the data sits in that INI file, the greater the loss if the user tampers with it/them.
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