/**
 * Sanitizes JSON string for PostgreSQL jsonb:
 * - Removes problematic Unicode sequences:
 *   - \u0000 (null character) - causes error 22P05 "unsupported Unicode escape sequence"
 *   - \uD800-\uDFFF (unpaired surrogates) - causes "Unicode low surrogate must follow a high surrogate"
 *   - \\uD800 (escaped-backslash + surrogate, e.g. from JS regex literals like [^\ud800-\udfff]):
 *     removing just \uXXXX would leave a dangling backslash that creates a new invalid escape (e.g. \-)
 * - Escapes any remaining invalid JSON escape sequences (e.g. \v, \k, \-)
 */
export declare function sanitizeJsonForPg(jsonString: string): string;
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