/** Inclusive lower bound of a UTC day, in the stored full-ISO-Z form. */
export declare function utcDayStart(day: string): string;
/** EXCLUSIVE upper bound of a UTC day — the next day's start. UTC has no DST, so
 *  adding 24h is exact. */
export declare function utcDayAfter(day: string): string;
/**
 * Smallest string strictly greater than every string starting with `prefix`, so a
 * prefix match becomes the sargable range `col >= prefix AND col < succ(prefix)`.
 * Strip trailing maximal code points, increment the last remaining one; an
 * all-maximal prefix has no upper bound (undefined = omit the clause).
 *
 * Defined over CODE POINTS, which is order-equivalent to UTF-8 byte order — the
 * order SQLite's BINARY collation and Postgres's COLLATE "C" both use.
 */
export declare function namespacePrefixUpperBound(prefix: string): string | undefined;
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