/**
 * Shared utility functions for the memory subsystem.
 *
 * Centralises helpers that were previously copy-pasted across
 * schema.ts, episodes.ts, semantic.ts, consolidation.ts,
 * voice-sig.ts and bootstrap.ts.
 */
/** Generate a prefixed unique identifier (e.g. "sn_a1b2c3d4e5f6"). */
export declare function generateId(prefix: string): string;
/** Current UTC time as an ISO-8601 string. */
export declare function nowISO(): string;
/** JSON-stringify a value, returning null for undefined/null inputs. */
export declare function jsonOrNull(val: unknown): string | null;
/** Safely parse a JSON string into a string array, defaulting to []. */
export declare function parseJsonArray(val: string | null | undefined): string[];
/**
 * Parse a human-readable relative time string or ISO-8601 timestamp into an
 * ISO-8601 string.  Returns `undefined` for unrecognised input.
 *
 * Supported formats:
 *   - ISO-8601 strings (returned as-is)
 *   - "last 24h", "last 24 hours"
 *   - "last 7d", "last 7 days", "last week"
 *   - "last 1h", "last hour"
 *   - "yesterday"
 *   - "today"
 */
export declare function parseRelativeTime(input: string): string | undefined;
/** Safely parse a JSON string into an object, defaulting to {}. */
export declare function parseJsonObject(val: string | null | undefined): Record<string, unknown>;
/**
 * Resolve an optional `validUntil` argument into a strictly-future ISO timestamp,
 * or null. Garbage (unparseable) and past/now instants both yield null so the
 * note is saved permanent rather than born already-due. Exported for tests.
 */
export declare function resolveFutureExpiry(validUntil: unknown): string | null;
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