Function buildFallbackPayload

buildFallbackPayload(
    cachedData: unknown,
    err: unknown,
    cachedAt: string,
    stale: boolean,
): Record<string, unknown>
Build a standardised fallback payload with metadata indicating cache usage. The _vintageAnnotation is the renderer's source of truth for the >6mo vintage badge (yellow / red).
Parameters
- cachedData: unknown
- err: unknown
- cachedAt: string
- stale: boolean
Returns Record<string, unknown>
- Defined in scripts/imf-fetch/cache.ts:78