存储趋势数据的最佳方法是什么？

I am currently building an application where I am importing statistical data for (currently) around 15,000 products. At current, if I was to maintain one database table for each day statistics from one source it would be increased by 15,000 rows of data (let's say 5-10 fields per row primarily float, int) per day. Obviously equating to over 5 million records per year into one table.I am currently building an application where I