I don't think that's right.

Citus has a post from 2017 talking about allowing for horizontal scaling of a postgres instance. [0]

Same thing with Timescale. [1]

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[0] https://citusdata.com/blog/2017/02/16/citus61-released/

[1] https://blog.timescale.com/blog/timescaledb-2-0-a-multi-node...