Yes, the approach would be to use the exact same session:

     dbSession =  SQLSession.sql_session()
     functionA()
     functionB()
     dbSession.close()

It looks like functionA and functionB each call `SQLSession.sql_session()`, 
which will cause problems. I believe that will create multiple sessions, 
which will have different data and may cause blocking and transactional 
issues.

I usually write my celery tasks like this:

     def task_foo():
         dbSession =  new_session()
         functionA(dbSession)
         functionB(dbSession)
         dbSession.close()



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