feat: Füge die Spalten ValidFrom und ValidTo zur UserRep-Entität hinzu.

DigitalData.UserManager.Domain/Entities/UserRep.cs

@@ -18,6 +18,12 @@ namespace DigitalData.UserManager.Domain.Entities
         [Column("REPR_USER")]
         public int? RepUserId { get; set; }
 
+        [Column("VALID_FROM")]
+        public required DateTime ValidFrom { get; set; }
+
+        [Column("VALID_TO")]
+        public required DateTime ValidTo { get; set; }
+
         [ForeignKey("UserId")]
         public virtual User? User { get; set; }