I’m ready to expand my existing inventory platform by adding an advanced reporting module focused on sales-trend analysis. The current system is stable and already tracks stock transactions, so you’ll be building on a solid foundation rather than fixing bugs. What I need • A set of actionable sales-trend reports that pull data from the live inventory database and present it in clear, filterable charts and tables. • Intuitive drill-downs that let users slice results by product, category, date range, and location. • Export options to PDF and Excel, plus the ability to schedule emailed snapshots. • Clean, well-commented code that fits the project’s existing tech stack (MySQL, PHP 7, and a Bootstrap front-end). If you prefer a lightweight reporting library or a JS charting tool such as Chart.js or Highcharts, mention it—performance matters. Acceptance criteria 1. Reports render in under three seconds on a 50 k-row dataset. 2. Filters, pagination, and exports work in the latest Chrome and Edge browsers. 3. All new database queries are indexed, and schema changes (if any) are documented. 4. A brief README explains how to deploy the new module on staging and production. Once the module is live and tested, future enhancements—like stock-level dashboards or supplier analytics—are on the horizon, so maintainability is key. Let me know how you would approach the build and roughly how long integration and testing will take.