The stale-while-revalidate pattern queues background fetches via the AdapterQueue,
but with 227+ pending jobs, short interest keys take too long to process.
Users saw empty panels on every symbol because the fetch never completed before
the response returned.
Fix:
- shortInterest procedure: when Yahoo + NASDAQ caches are both empty, fetch
directly via the adapters, store in cache, and return — all within the request.
Subsequent requests hit the cache. Bypasses the clogged queue entirely.
- FinraBulkAdapter: guard against per-symbol keys (non-'latest' and non-date IDs)
by returning a skipped result instead of trying to download a file named
after the ticker.
- finraShortInterest handler: return isStale=false when no data is in the table,
so per-symbol reads never trigger queue fetches (FINRA is schedule-only).
Router stale computation now excludes FINRA from the combined stale flag.
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