Develop an interactive data analytics dashboard to provide real-time insights into key business metrics, such as revenue, orders, marketing campaign performance, customer demographics, and inventory levels. The dashboard should allow users to drill down into data and filter based on specific parameters. Key requirements include:

- Data integration from multiple data sources, including CRM, ERP, and marketing automation systems
- Customizable widgets and visualizations to display data in various formats (e.g., charts, graphs, tables)
- User role-based access and permission management
- Secure data handling and authentication mechanisms
- Scalable and performant design to handle large data volumes
- Integration with external reporting tools for data export