Smart Resume for File Transfers in Rust — Never Start Over

Short summary

Implement resumable file transfers by tracking state in SQLite with transferred_bytes and file_hash. On connection failure, seek to the last confirmed offset and resume the transfer, updating progress periodically to minimize database overhead. Always hash-verify the completed file to detect corruption—a failed resume is worse than restarting from scratch.

• •Track file transfer state in SQLite to enable resumption after failures
• •Seek to last confirmed offset and append remaining bytes on retry
• •Validate final hash after transfer to detect corruption

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