[gopalv]

> Postgress makes a copy of _every_ row

That's what the zHeap storage engine for Postgres fixes - in-place updates for fixed width data.

https://github.com/EnterpriseDB/zheap

[hildaman]

"for eventual integration into PostgreSQL"..

[Tostino]

And is being actively developed through the mailing list. Feel free to follow the progress. It's great to watch it happen in real time.