Pierangelo Masarati writes:
referral return when writing to a shadow database is handled by the frontend. That's why the slapo-chain(5) instance needs to be global. That's also the main reason global overlays were introduced at all.
Please put that in the doc. (both slapo-chain and replication docs?) Also slapo-chain's "overlay chain" section which says "it is mainly intended for use with local storage backends". That may be technically correct, but in this context it's misleading.