/** Maximum stored image size (~5 MB of raw PNG bytes). */
export declare const RECAP_IMAGE_MAX_BYTES: number;
/** Only `image/png` is ever stored or served. */
export declare const RECAP_IMAGE_CONTENT_TYPE = "image/png";
/**
 * Stored recap images older than this are pruned on the next write (30 days).
 * Each PR push uploads a fresh screenshot under a new token; without expiry the
 * table — and the set of anonymously-fetchable image URLs — would grow without
 * bound. 30 days comfortably outlives any PR's review window.
 */
export declare const RECAP_IMAGE_TTL_MS: number;
export declare function ensureRecapImageTable(): Promise<void>;
/**
 * Delete recap images older than {@link RECAP_IMAGE_TTL_MS}. Called best-effort
 * after each write so the table stays bounded. Returns the number of rows
 * removed. Dialect-agnostic (a plain `DELETE ... WHERE created_at < ?`).
 */
export declare function pruneExpiredRecapImages(now?: number): Promise<number>;
/** Generate a long, unguessable lowercase-hex token (default 32 bytes → 64 hex chars). */
export declare function generateRecapImageToken(byteLength?: number): string;
/** True when `token` matches the strict hex token format (no traversal characters). */
export declare function isValidRecapImageToken(token: string | undefined | null): boolean;
export interface StoredRecapImage {
    bytes: Buffer;
    contentType: string;
}
/**
 * Store PNG bytes and return the freshly minted token. Caller is responsible
 * for enforcing the size cap before calling (we re-check defensively here too).
 */
export declare function saveRecapImage(png: Buffer, options?: {
    ownerEmail?: string | null;
}): Promise<{
    token: string;
}>;
/**
 * Load a stored image by token. Returns `null` for an unknown or malformed
 * token. Never returns anything but the opaque image bytes — no plan data.
 */
export declare function getRecapImage(token: string): Promise<StoredRecapImage | null>;
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