The record whose @deco.Encrypted property was read. Its class and
primaryKeyValue() identify the row; a record not yet saved has no
primary key.
The column holding the property's ciphertext, e.g. 'encryptedPhone'.
The @deco.Encrypted property that was read, e.g. 'phone'.
Passed to
dreamApp.on('encryption:legacy-key-used', ...)callbacks.