I am currently using the SQLAlchemy ORM and I'd like to be able to start up transactions using PostgreSQL's SERIALIZABLE READ ONLY DEFERRABLE isolation level. I don't want every single transaction to use this isolation level nor do I have the ability to change the server configuration so I need to do it in my application. My question is, what is the best way to go about achieving this? I tried setting the execution_option to "SERIALIZABLE READ ONLY DEFERRABLE" but that fails with the error message of "Valid isolation levels for postgresql are REPEATABLE READ, AUTOCOMMIT, SERIALIZABLE, READ COMMITTED, READ UNCOMMITTED".
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