Why are Live data updates restricted to 90 days?

I wanted to update my live consumption data for about 45 days in 2016 when the power meter went nuts. I can still see the historical live data, but cannot modify anything that old. I settled for updating the daily numbers with the CSV bulk loader.

If anyone can comment, I’m just technically interested in the reason the older live data is not modifiable. Something to do with archived storage?? Or maybe upload bandwidth requirements for all those 5 minute data points??

Older data is moved to read-only archived storage which is cheaper to store.

Thanks for the answer. PVoutput is great!