Create an invoice management database application in English. The app will store both incoming and issued invoices, tracking crucial details such as date, quantity, and prices. It should also capture invoice number, client, date, payment terms, and amount for each invoice.

## User Interface
Design an intuitive user interface allowing users to easily add, view, update, and delete invoices. Include forms for inputting all necessary invoice details. Users should be able to filter and search invoices based on date, client, and invoice number. Provide summary views to track outstanding invoices and payments.

## Security
Implement a secure password login system to ensure only authorized users can access the database. Consider additional measures such as data encryption for sensitive information.

## Interaction
Users interact with the database through a clear and concise interface. Each action, such as adding or editing an invoice, should be confirmed to avoid errors. Implement user prompts for saving changes and validation messages for incorrect data entries.

## Best Practices 
Include functionality for exporting invoice data to common formats like CSV or PDF for reporting purposes. Ensure the database is scalable to handle a growing number of invoices over time. Implement backup systems to prevent data loss.

I need a database to record my incoming invoices and issued invoices it should have date and quantity and prices

Q: What other details should be included for each invoice?
A: Invoice number , client , date, payment terms, amount

Q: How will users interact with the database?
A: It requires user interface 

Q: How will you manage access and security for the database?
A: Password