/**
 * @deprecated Legacy helper kept for callers that still need filename-safe
 * labels. New session ids are opaque and do not include model/provider names.
 */
export declare function sanitizeModel(model: string): string;
/**
 * Generate a session ID in the format:
 *   `YYYY-MM-DD/sess_<ULID>`
 *
 * Examples:
 *   `2026-06-06/sess_01JX2S9V7T5M6N7P8Q9R0STXVW`
 *
 * The date prefix becomes a subdirectory so sessions group naturally by day.
 * The leaf is an opaque sortable id; provider/model names belong in metadata,
 * not file paths. Older IDs that contain model/provider text remain readable.
 */
export declare function generateSessionId(startedAt: string, _model?: string): string;
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