Disabling START TRANSACTION for a SuperUser

Hi,

I have created a readonly user by executing the following statements,
CREATE USER backupadm SUPERUSER  password 'mypass';
ALTER USER backupadm set default_transaction_read_only = on;

But the backupadm user is able to create/update table when using START
TRANSACTION READ WRITE and then COMMIT;

Is there any way to block/disabling an User from running Transactions?

Thanks in advance.



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