One more comment - think about the storage needed to keep your then signature, avatar, etc. at the time of every post, with every post, rather than having the current stored in one place and just looked up each time the system is asked to display a post from you. It's the difference between what I'd call a transaction database and a current status database. Transactions need a lot more effort and storage to retain and display. IT guys, please excuse the musings of a manager-type, ex-chemist!
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