/** A single message in a chat session. */
interface SessionMessage {
    id: string;
    role: 'user' | 'assistant' | 'system';
    sessionID?: string;
    time?: {
        created?: number;
        updated?: number;
        completed?: number;
    };
    /** Monotonically increasing insertion index for stable ordering. */
    _insertionIndex?: number;
}

export type { SessionMessage as S };