The 5min-averaging is good in most cases, but if you have short discrete events, like door sensors or PIRs or other devices with short on/off intervals you would like to log in database they are showed wrong in the graph page wether the database interval set shorter.
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[Solved] How to avoid 5min-averaging in graph page for shorter discrete events?
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For discrete devices the problem is manily solved. See this newer thread for details.