Kunthawat Greethong 63058ecfc9 [verified] Add daily cache layer (fetch-once/day, stale fallback, atomic write) ...

- DailyCache: JSON file cache keyed by (source/as_of), TTL 24h, atomic tmp+rename write, persists across runs
- fetch_or_stale: returns fresh cache, else refetch+cache, else falls back to stale so dashboard is never blanked
- 7 tests; full suite pass

2026-08-25 15:29:15 +07:00

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