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Don't worry about "too many prefixes on the same partition", nowaways s3 can handle that pretty well.
What is a big issue is generating too many partitions, the purpose of partitions is help the reading reduce the data read but if the partitions are too granular, then it's counterproductive. On most cases hour or even day are the best granularity (depending on how much data, history and how users will use the table)
