I run a wholesale business that deals exclusively in silver articles and I need a Windows-compatible, command-line billing program that streamlines our day-to-day operations without the overhead of a graphical interface. The tool has to feel snappy inside the terminal yet cover every task we handle at the counter and in the back office. Core features I must see on first delivery: • Inventory management – update stock in real time as items are bought or returned, track quantity by weight or piece, and flag low-stock thresholds. • Customer database – create, edit, and search customer records quickly; basic contact info is fine, but it must also remember each client’s last purchase. • Sales reporting – daily and monthly summaries exportable to CSV or Excel so I can forward numbers straight to my accountant. • Metal transaction handling – enter silver rate once, have the program calculate value automatically when billing by weight, and let me adjust the rate mid-day without breaking existing invoices. CLI requirements The entire workflow should live in the terminal: clean menus, fast keyboard shortcuts, clear prompts, and printable receipts (PDF or direct-to-printer) triggered from the same interface. It must install and run smoothly on current 64-bit Windows 10/11 machines without additional server software. Data storage A lightweight local database such as SQLite is ideal, but I am open to other file-based options as long as backup and restore are straightforward. Acceptance The build is finished when I can: 1. Install with a single installer or copy-and-run folder. 2. Create an invoice, adjust the silver rate, and see the correct total update. 3. Generate an end-of-day sales report that opens in Excel. 4. Restore my data from a backup file onto a fresh machine. If you can deliver clean, documented code and a concise user guide, we can move forward quickly.