[bugfix][xs]: correct bad argument bad argument to synchronize_session parameter for sqlalchemy query.delete which was resulting in 500 errors.
[bugfix][xs]: correct bad argument bad argument to synchronize_session parameter for sqlalchemy query.delete which was resulting in 500 errors.

  * Error was subtle: occurred post-login after asking a question (but then happened permanently!)
    * Message: InvalidRequestError: Could not evaluate current criteria in Python.  Specify 'fetch' or False for the synchronize_session parameter.
    * Could be to do with a newer version of sqlalchemy but does not look to be ...

mitsuhiko/solace,mitsuhiko/solace