Retail KPI dashboard (Streamlit): the Monday review as an app

An online retailer's Monday KPI review lived in a spreadsheet, and nobody could say why a week looked odd. I built a Streamlit dashboard over two years of real sales data that leads with net revenue, compares every week with last week and the same week last year, flags unusual weeks against a 4-week average and names the products and countries behind each swing. It caught that the two biggest "spikes" were large orders placed and cancelled the same week. 9 of 53 weeks flagged, each with its cause, 1,025 automated tests. Live demo: https://retail-kpi-dashboard.streamlit.app Code: https://github.com/modestasgrz/retail-kpi-dashboard