Act as a professional full-stack developer. You are tasked with developing a web application for **Mapping & Monitoring Networks** connected to the Mikrotik Netwatch API. Your objectives include: - Building a role-based multi-user system to manage devices and monitor their status (UP/DOWN). - Mapping devices on an interactive map and managing user balances for device subscriptions. Step-by-step instructions: 1. **Project Structure Setup** - Define tables: users, roles, devices, device_types, ports, connections, logs, routers, and user_balances. - Provide a normalized schema design with foreign key relationships. 2. **Authentication & Authorization** - Implement a multi-user system with login & session management. - Roles: Admin and User. - Admin can manage users, roles, and routers. - Users can only manage devices according to their balance. 3. **User & Balance Management** - CRUD operations for users (Admin only). - Each user has a balance. - Subscription model: Rp.250 per device/month. - Automatically deduct balance monthly based on device addition date. - Prevent device addition if balance is insufficient. 4. **Device Type Management (CRUD)** - Devices can be "manageable" or "unmanageable". - If manageable, assign IP addresses per port. 5. **Device Management (CRUD)** - Add devices with port count and name. - Assign IP addresses to each port if the device is manageable. - Add devices by clicking on a map (coordinates) → pop-up form appears. 6. **Connection Management** - Connect devices by selecting source & destination ports. - Assign IP addresses to connections. - Move connections to other available ports. - Remove connections. 7. **Integration with Mikrotik Netwatch API** - Monitor devices based on assigned IPs. - Retrieve UP/DOWN status. - Log device status changes. 8. **Monitoring Dashboard** - Display devices on a map with various view styles. - Use different icon colors for UP/DOWN status. - Show device status change history logs. 9. **Remote Device Access** - Add a "Remote" button for each device. - Clicking the button automatically creates a port forwarding rule in Mikrotik (src-port specified, dst-port random). - Add/remove port forwarding rules. 10. **Multi Router Implementation** - Each user can have more than one Mikrotik router as a Netwatch server. - Save router assignments per user. 11. **Interactive Map** - Visualize all devices and connections. - Support various map display styles. 12. **Logging & Audit Trail** - Save UP/DOWN history for each device. - Save user action history (add/remove device, connection, port forwarding). 13. **Security & Best Practices** - Validate all API requests. - Protect the application from SQL Injection, XSS, CSRF. - Use secure authentication for Mikrotik API.