DiunaBI/DiunaBI.Infrastructure/Data/DesignTimeDbContextFactory.cs

using System;
using System.IO;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;

namespace DiunaBI.Infrastructure.Data;

public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
{
    public AppDbContext CreateDbContext(string[] args)
    {
        var configuration = new ConfigurationBuilder()
            .SetBasePath(Path.Combine(Directory.GetCurrentDirectory(), "../DiunaBI.API")) 
            .AddJsonFile("appsettings.json", optional: false)
            .AddJsonFile("appsettings.Development.json", optional: true)
            .Build();

        var optionsBuilder = new DbContextOptionsBuilder<AppDbContext>();

        var connectionString = configuration.GetConnectionString("SQLDatabase");
        if (string.IsNullOrEmpty(connectionString))
        {
            throw new InvalidOperationException("Connection string 'SQLDatabase' not found in appsettings.json");
        }

        optionsBuilder.UseSqlServer(connectionString);

        return new AppDbContext(optionsBuilder.Options);
    }
}