How can the query/merge or query/add be performed atomically? What would happen if between the two calls another process inserted a row with the same unique key? Wouldn't the `s.merge()` then trigger a `psycopg2.errors.UniqueViolation` exception (in postgres case) when the new row insert is flushed? Is there a way to make the execution of the ORM atomic so that the `s.merge()` would be guaranteed to succeed (barring network errors, etc.)?
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