DiunaBI/WebAPI/dataProcessors/copy.processor.cs

using Google.Apis.Sheets.v4;
using System.Globalization;
using WebAPI.Models;

namespace WebAPI.dataProcessors
{
    public class CopyProcessor
    {
        private AppDbContext db;

        public CopyProcessor(
            AppDbContext _db)
        {
            db = _db;
        }

        public Layer process(Layer sourceLayer)
        {
            Layer dataSource = this.db.Layers
                .Where(x => x.ParentId == sourceLayer.Id)
                .OrderByDescending(x => x.CreatedAt)
                .First();
                
            return null;
        }
    }
}