Step to implement

Install/ Add Microsoft.EntityFrameworkCore.Sqlite to Project

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    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.7" />

Register App db Context before var app = builder.Build(); in MauiProgram.cs

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var dbPath = Path.Combine(FileSystem.AppDataDirectory, "waterreminder.db3");

builder.Services.AddDbContext<AppDbContext>(options => options.UseSqlite($"Filename={dbPath}"));

Just Before app run add this Command

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// Initialize the database 
using (var scope = app.Services.CreateScope())
{
    var dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
    dbContext.Database.EnsureCreated();
}

return app;

Create Add Db Context

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namespace WaterReminder.Data;

public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
{
    public DbSet<Reminder> Reminders { get; set; }
}

Below is service or uses

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public class ReminderService : IReminderService
{
    private readonly AppDbContext _context;

    public ReminderService(AppDbContext context)
    {
        _context = context; 
    }

    public Task<List<Reminder>> GetRemindersAsync() => _context.Reminders.ToListAsync();
}