How do you use SQLite for local relational data in MAUI?

Add the sqlite-net-pcl (or Microsoft.Data.Sqlite) package, create a database file path under FileSystem.AppDataDirectory, define models with attributes, and use an SQLiteAsyncConnection to create tables and run async CRUD. It's the standard choice for structured offline data.

var db = new SQLiteAsyncConnection(
    Path.Combine(FileSystem.AppDataDirectory, "app.db3"));
await db.CreateTableAsync<Note>();
await db.InsertAsync(new Note { Text = "Hello" });
var notes = await db.Table<Note>().ToListAsync();