Stop Rewriting the Same LLM Boilerplate: Batch-Process DataFrames in 3 Lines

I processed a 158K-row product catalog through GPT-4 last year. Free-text descriptions in, structured attributes out — brand, category, material, quality score. The script ran over a weekend. Monday morning: $400 gone, crashed at row 91K, no checkpoint. I restarted from zero. That was the fourth time I'd written the same batch-processing boilerplate for an LLM job. Retry logic, rate-limit handling, checkpoint/resume, cost tracking, structured output validation. Different project each time, sam...