jgrusewski 3d63f73c08 fix: add retry with backoff to Databento download_quarter ...

3 retries with exponential backoff (2s, 4s, 8s) for transient
connection failures (IncompleteBody/UnexpectedEof). Partial files
are deleted before retry so skip-existing logic works correctly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-31 22:57:43 +02:00

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