Insufficient serialisation?
We have from time to time warnings (such as "Warning: got Origin where source is 72536/gemini://gemini.circumlunar.space/users/fgaz/calculator/0/0/:/8/2/ and destination is 479242 which was not found") that should not happen. It may indicate that the serialisation of PostgreSQL transactions is not sufficient and we should switch to a stricter serialisation.