[kiwicopple]

> Why is there no InnoDB for PostgreSQL?

(we maintain OrioleDB) Mostly because the TAM API isn't mature enough yet. Hopefully we can upstream more patches so that it's possible

> undo-based MVCC storage engine project stall?

From what I could gather, it ran out of steam simply because of the difficulty of the task. There is a lot of work involved to get the requisite patches into core and the community are (correctly) cautious