A bit of a shameless plug, but I've been working on this for a few months in the form of an extension: https://github.com/xataio/deltax

When I started I thought there's too much inherent overhead in using Postgres tables for storage and using the Postgres executor, so figured it would be pretty cool to match Timescale in performance. I didn't think it would be possible to get close to dedicated analytical DBs. But as the project progressed and the performance got better and better, I'm now firmly in the camp of doing analytics with Postgres + an extension.

Thanks for sharing. That looks promising, good luck!