> I'm assuming this is an error you see in the logs but isn't actually 
making anyone's request fail, otherwise it's something different. 
Yes, that is what is happening.

AH HA, I GOT IT!

The application startup routine had this block in it:

   dbEngine = ...
   dbSession = ...
   ... setup ...
   dbEngine.dispose()

this fixed it:

   dbEngine = ...
   dbSession = ...
   try:
       ... setup ...
   finally:
       dbSession.close()
   dbEngine.dispose()


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