With query() I can add with_lockmode('for update'). Can I do so on a
session.refresh()? What about a get()?

I see this as a useful approach to a two phase large query, where one
wants to avoid locking a large number of rows.  First you would issue
a non-locking query and then, once you have a candidate object you
could call refresh with a lock, so you know you have the most recent
data and that it is locked.

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