So you're querying a 'users logged in table' and if the current user 
goes to log off, and they're the only person in that table, then a 
backup happens?

If that's the case then the situation you mention won't happen, because 
there will either be >1 records in the 'users logged in table' or there 
won't. So even if 2 log off at almost the same time, they will never 
both see 1 record.



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