> On Jun 28, 2017, at 11:39 AM, Chris Travers <chris(dot)travers(at)gmail(dot)com> wrote:
>
> For that, you could use xmin. That tracks the transaction where the row first became visible.
> On Jun 28, 2017, at 4:34 PM, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
>
> What you are describing is called 'optimistic locking’. […]
> https://blog.2ndquadrant.com/postgresql-anti-patterns-read-modify-write-cycles/
Thanks, both answers helped.
Rob