http://docs.sqlalchemy.org/en/latest/core/pooling.html

specifically:
  
http://docs.sqlalchemy.org/en/latest/core/pooling.html#disconnect-handling-pessimistic
and
  
http://docs.sqlalchemy.org/en/latest/core/pooling.html#custom-legacy-pessimistic-ping

There is also:
  
 
http://docs.sqlalchemy.org/en/latest/core/pooling.html#disconnect-handling-optimistic

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