add xmldoc comments

web/backend/Domain/Domain.Entities/Entities/UserVerification.cs

@@ -1,9 +1,29 @@
 namespace Domain.Entities;
 
+/// <summary>
+/// Records that a <see cref="UserAccount"/> has completed verification (e.g., email confirmation).
+/// Maps to the <c>UserVerification</c> table. A user account has at most one verification record,
+/// and it is deleted automatically when the owning user account is deleted.
+/// </summary>
 public class UserVerification
 {
+   /// <summary>
+   /// Primary key identifying this verification record. Maps to <c>UserVerificationID</c>.
+   /// </summary>
    public Guid UserVerificationId { get; set; }
+
+   /// <summary>
+   /// Foreign key referencing the verified <see cref="UserAccount"/>. Maps to <c>UserAccountID</c>; unique, enforcing a one-to-one relationship.
+   /// </summary>
    public Guid UserAccountId { get; set; }
+
+   /// <summary>
+   /// The date and time at which the user account was verified.
+   /// </summary>
    public DateTime VerificationDateTime { get; set; }
+
+   /// <summary>
+   /// SQL Server <c>ROWVERSION</c> concurrency token used to detect concurrent updates. <c>null</c> until the row has been read from the database.
+   /// </summary>
    public byte[]? Timer { get; set; }
 }