better-genshin-impact/BetterGenshinImpact/Model/Database/ApplicationDbContext.cs

using System.IO;
using BetterGenshinImpact.Core.Config;
using Microsoft.EntityFrameworkCore;

namespace BetterGenshinImpact.Model.Database
{
    public class ApplicationDbContext : DbContext
    {
        public DbSet<TaskList> TaskLists { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            var dbPath = Path.Combine(Global.Absolute("User\\db"), "Data", "bgi_user.db");
            Directory.CreateDirectory(Path.GetDirectoryName(dbPath)!);
            optionsBuilder.UseSqlite($"Data Source={dbPath}");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<TaskList>()
                .HasIndex(t => t.OrderIndex)
                .IsUnique();
        }
    }
}