Thank you Mike for the information, that all makes sense. I ended up with 
the same approach that SQLA takes: a “Session” object owned by a 
DataManager, joined to the Request’s TransactionManager. And then just pass 
a `dbsession` and `fnsession` and `jobsession` around to functions as 
needed.

Added yet another one or two parameters (sigh) to functions, but it keeps 
things functional and without outside (global, thread-local) state.

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