I'd like to delete all Transactions contained in an account hierarchy
without loading any transaction into memory, just DB work with the SQL
DELETE request constructed by SA.

The query that defines the transactions is:
Session.query(Transaction).join(['entries','account','root'],
aliased=True).filter_by(account_id=1).all()

How can I use it to construct and execute the DELETE statement?

Thanks for any help.
jean-philippe
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