source: StockMaster/Models/Product.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace StockMaster.Models
{
    [Table("product", Schema = "stock_management")]
    public class Product
    {
        [Key]
        [Column("product_id")]
        public int ProductId { get; set; }

        [Required(ErrorMessage = "Product name is required")]
        [MaxLength(100)]
        [Column("name")]
        public string Name { get; set; }

        [Column("description")]
        public string Description { get; set; }

        [Required(ErrorMessage = "SKU is required")]
        [MaxLength(50)]
        [Column("sku")]
        public string Sku { get; set; }

        [Required(ErrorMessage = "Unit price is required")]
        [Range(0.01, double.MaxValue, ErrorMessage = "Unit price must be greater than 0")]
        [Column("unit_price")]
        public decimal UnitPrice { get; set; }

        [Column("reorder_level")]
        public int ReorderLevel { get; set; } = 10;

        [Column("category_id")]
        public int? CategoryId { get; set; }

        [ForeignKey("CategoryId")]
        public Category Category { get; set; }

        [Column("supplier_id")]
        public int? SupplierId { get; set; }

        [ForeignKey("SupplierId")]
        public Supplier Supplier { get; set; }

        [Column("is_active")]
        public bool IsActive { get; set; } = true;

        [Column("created_at")]
        public DateTime CreatedAt { get; set; } = DateTime.Now;
    }
}