changes

Models/Node.cs

@@ -0,0 +1,36 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace public_valetax.Models
+{
+    [Table("nodes")]
+    public class Node
+    {
+        [Key]
+        [Column("id")]
+        public long Id { get; set; }
+
+        [Required]
+        [Column("tree_id")]
+        public long TreeId { get; set; }
+
+        [Column("parent_id")]
+        public long? ParentId { get; set; }
+
+        [Required]
+        [Column("name")]
+        public string Name { get; set; } = string.Empty;
+
+        [Column("created_at")]
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+        // Navigation properties
+        [ForeignKey("TreeId")]
+        public Tree Tree { get; set; } = null!;
+
+        [ForeignKey("ParentId")]
+        public Node? Parent { get; set; }
+
+        public ICollection<Node> Children { get; set; } = [];
+    }
+}