Here's a recommended database schema for storing the customer information and tracking invoices:

customers
- id (Primary Key, auto-incrementing)
- name
- address
- email
- phone

invoices
- id (Primary Key, auto-incrementing)
- invoice_number (Unique)
- date
- customer_id (Foreign Key referencing customers.id)
- item
- amount
- paid (Boolean, default: false)
- due_date

With this schema, you can store customer information in the customers table and track their invoices in the invoices table. The customer_id column in the invoices table is a foreign key that references the id column in the customers table, allowing you to associate each invoice with a specific customer. The paid column in the invoices table is a boolean value that indicates whether an invoice has been paid or not, and the due_date column stores the date that the invoice is due.

You can then use this schema to query the database and retrieve the information you need to track invoices and customer information. For example, you can retrieve all overdue invoices by querying the invoices table for all invoices where the paid column is set to false and the due_date is before the current date.
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