we don't currently have an answer for that, other than "be careful what order you do your MERGE statements in" because
MERGE will take a full-table lock even in MVCC mode, and, as you found out, if you do MERGE statements in different
orders in different transactions, you will get a timeout.
We probably need a LOCK TABLE command to make this kind of thing work in MVCC mode for places where it is impossible to
order the MERGE commands consistently.
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