Might as well ask for instructions on how to tie your shoes or brush your teeth. Some topics are basics and it should be expected you know them or research them yourself.
That is the idea of "Frequently Asked Questions"...
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Poolwaffle: since you already have round data in the database (end time + number of shares), why not just calculate hashrate based on that? (for say, 10 rounds, and for the current round). No extra processing or data storage required that way.