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Database design for a reccomendation system

It's a lot better now. Simpler than it was before, which is always good. I still have some remarks: The table named tag is probably meant to attach meaning to a photo through a type and name. That's ...
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Designing database job monitoring

Why not just check with simple SQL query if specific results come back? Like: Select data from table @ db1, and see if results come back, if not Nagios check will fail.
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Store UUID Reference vs. storing string in Mongodb

Using the plain names is more like a fallback when UUID is not possible. UUID is unique and bound to the data itself, while name adds an indirect layer: use_site -> name -> data. Since you are ...
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