export const BACKOFF_BASE_MS = 30_000;
export const BACKOFF_MAX_MS = 60 * 60 * 1000;
/** After this many attempts a row is marked failed (a durable, terminal retry record). */
export const MAX_ATTEMPTS = 12;

/** Exponential per-row delay after `attempts` failures, capped at one hour. */
export function backoffMs(attempts: number): number {
  if (attempts <= 0) return 0;
  return Math.min(BACKOFF_BASE_MS * 2 ** (attempts - 1), BACKOFF_MAX_MS);
}

export function nextAttemptAt(attempts: number, lastAttemptAt: Date): Date {
  return new Date(lastAttemptAt.getTime() + backoffMs(attempts));
}