Batch GMROII calculator for bookstores — upload a CSV, get optimal order quantities, stock coverage, and portfolio metrics. Single HTML file, no dependencies.

Single-title GMROII calculator for bookstores — optimize order quantity, stock coverage, and reorder timing with lead time support. Single HTML file, no dependencies.

MVP for retail demand forecasting and automated replenishment. LightGBM forecast per store×SKU, order optimization with expiration cap, and configurable policy modes (service-first, waste-first, balanced).