Yijia-Xiao b20c8e60a4 fix(dataflows): keep vendor API keys out of request errors ...

- FRED and Alpha Vantage authenticate with a query parameter, and requests
  quotes the full URL in HTTP, connection and timeout errors, so the key was
  written into any log or traceback that recorded one
- route both vendors through one request helper that re-raises a requests error
  as the same class with the key removed, carrying no request, response or
  exception chain, each of which still held the URL #1324

2026-09-14 22:38:19 +00:00

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