OptionalidentifierOptional caller-supplied identifier. When non-empty, the note is upserted
on (sessionId, name='note', identifier) — repeated calls with the same
identifier overwrite the existing note. When omitted, the server stamps a
unique px-session-note:<uuid> identifier so each call appends a new note.
The note text to add to the session.
The session ID used to track a conversation, thread, or session.
Parameters for a single session note.