docs: def scoped_session_decorator(func):
      """Manage contexts and add debugging to psiTurk sessions."""
      @wraps(func)
      def wrapper(*args, **kwargs):
          from wallace.db import session as wallace_session
          with sessions_scope(wallace_session) as session:
              from psiturk.db import db_session as psi_session
              with sessions_scope(psi_session) as session_psiturk:
                  # The sessions used in func come from the funcs globals, but
                  # they will be proxied thread locals vars from the session
                  # registry, and will therefore be identical to those returned
                  # by the context managers above.
                  logger.debug('Running worker %s in scoped DB sessions',
                               func.__name__)
                  return func(*args, **kwargs)
      return wrapper