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{"event": "chunk_start", "round": "router2_n2", "chunk": 0, "pages": 5, "size_bytes": 900563, "ts": "2026-06-12T21:11:59+0800"}
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{"event": "chunk_error", "round": "router2_n2", "chunk": 1, "pages": 5, "ok": false, "total_sec": 412.674, "type": "HTTPError", "error": "HTTP Error 500: Internal Server Error", "ts": "2026-06-12T21:18:51+0800"}
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