- moodContextSchema derives every enum from the vocabulary, so a value it does
not name answers 422 through returnAllZodIssues rather than being dropped
- the context is written in the same transaction as the entry and its links; a
failure rolls the entry back rather than leaving a client retrying a 5xx
into a duplicate
- an entry with nothing filled in stores no row, and a context that says
nothing removes the one that was there
- the create, list, detail and edit reads answer the context with its lists
decoded and its note decrypted; the ciphertext never leaves the server
