Function setErrorOnlyCacheEntry

cli/src/hooks/use-activity-query.ts:587–599

(
  queryKey: readonly unknown[],
  error: Error,
  errorUpdatedAt?: number,
)

 * This simulates what happens when a fetch fails with no prior successful data.
 */
export function setErrorOnlyCacheEntry(
  queryKey: readonly unknown[],
  error: Error,
  errorUpdatedAt?: number,
): void {
  const key = serializeQueryKey(queryKey)
  setCacheEntry(key, {
    data: undefined,
    dataUpdatedAt: 0,
    error,
    errorUpdatedAt: errorUpdatedAt ?? Date.now(),
  })
}

/**
 * Test helpers for verifying retry behavior.