gulmezeren2-byte/abc-xyz-inventory ? reverse-engineered prompt

Build me a Streamlit inventory planner that takes my monthly SKU data and turns it into something I can actually use.

I want to upload a CSV with sku, month, qty, and optionally unit_price, then see the items split into ABC and XYZ groups, with a simple 9 box view that tells me which products need tight forecasting, which ones need buffers, and which ones I should mostly leave alone. It should also show the Pareto style value split and a clear explanation of what to do for each class.

Please include a safety stock calculator too, using the usual formula, but make it honest about where it works well and where it breaks down for more erratic items. If a SKU looks too volatile, flag it so I don’t trust the result blindly. A couple of clean charts and a short summary of the key findings would be great.

If you need to, look up current Streamlit docs online and make it polished.