Have you had experience working with internal databases within your projects?

Yes, within iOS projects, working with internal databases to store application data locally is common.

The most common options are:

• Core Data — Apple's framework for managing object models and data storage. It allows working with objects that are stored in an SQLite database or other stores.
• SQLite — a lightweight relational database that can be accessed directly through SQL queries.
• Realm — a third-party database popular for its ease of use and high performance.

Experience may include:

• Designing data models.
• Implementing saving, updating, and deleting data.
• Optimizing queries and managing database migrations.

Example of using Core Data:

// Getting the context
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

// Creating a new object
let newItem = NSEntityDescription.insertNewObject(forEntityName: "Item", into: context)
newItem.setValue("Example", forKey: "name")

// Saving the context
try? context.save()

If you have experience with these technologies, it is worth mentioning it, describing specific tasks and results.