add xmldoc comments

web/backend/Infrastructure/Infrastructure.Repository/UserAccount/IUserAccountRepository.cs

@@ -1,14 +1,51 @@
 namespace Infrastructure.Repository.UserAccount;
 
+/// <summary>
+/// Repository for CRUD operations on user account records.
+/// </summary>
 public interface IUserAccountRepository
 {
+    /// <summary>
+    /// Retrieves a user account by its unique identifier.
+    /// </summary>
+    /// <param name="id">The unique identifier of the user account.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
     Task<Domain.Entities.UserAccount?> GetByIdAsync(Guid id);
+
+    /// <summary>
+    /// Retrieves all user accounts, optionally paginated.
+    /// </summary>
+    /// <param name="limit">The maximum number of records to return, or <c>null</c> for no limit.</param>
+    /// <param name="offset">The number of records to skip, or <c>null</c> for no offset.</param>
+    /// <returns>The collection of matching <see cref="Domain.Entities.UserAccount"/> records.</returns>
     Task<IEnumerable<Domain.Entities.UserAccount>> GetAllAsync(
         int? limit,
         int? offset
     );
+
+    /// <summary>
+    /// Updates an existing user account's details.
+    /// </summary>
+    /// <param name="userAccount">The user account containing updated values. Must have a valid <c>UserAccountId</c>.</param>
     Task UpdateAsync(Domain.Entities.UserAccount userAccount);
+
+    /// <summary>
+    /// Deletes a user account by its unique identifier.
+    /// </summary>
+    /// <param name="id">The unique identifier of the user account to delete.</param>
     Task DeleteAsync(Guid id);
+
+    /// <summary>
+    /// Retrieves a user account by username.
+    /// </summary>
+    /// <param name="username">The username to search for.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
     Task<Domain.Entities.UserAccount?> GetByUsernameAsync(string username);
+
+    /// <summary>
+    /// Retrieves a user account by email address.
+    /// </summary>
+    /// <param name="email">The email address to search for.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
     Task<Domain.Entities.UserAccount?> GetByEmailAsync(string email);
 }

web/backend/Infrastructure/Infrastructure.Repository/UserAccount/UserAccountRepository.cs

@@ -4,10 +4,21 @@ using Infrastructure.Repository.Sql;
 
 namespace Infrastructure.Repository.UserAccount;
 
+/// <summary>
+/// ADO.NET-based implementation of <see cref="IUserAccountRepository"/> backed by SQL Server
+/// stored procedures.
+/// </summary>
+/// <param name="connectionFactory">The factory used to create database connections.</param>
 public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
     : Repository<Domain.Entities.UserAccount>(connectionFactory),
         IUserAccountRepository
 {
+    /// <summary>
+    /// Retrieves a user account by ID using the <c>usp_GetUserAccountById</c> stored procedure.
+    /// </summary>
+    /// <param name="id">The unique identifier of the user account.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task<Domain.Entities.UserAccount?> GetByIdAsync(Guid id)
     {
         await using var connection = await CreateConnection();
@@ -21,6 +32,15 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         return await reader.ReadAsync() ? MapToEntity(reader) : null;
     }
 
+    /// <summary>
+    /// Retrieves all user accounts, optionally paginated, using the <c>usp_GetAllUserAccounts</c>
+    /// stored procedure. The <c>@Limit</c> and <c>@Offset</c> parameters are only added when their
+    /// corresponding argument has a value.
+    /// </summary>
+    /// <param name="limit">The maximum number of records to return, or <c>null</c> for no limit.</param>
+    /// <param name="offset">The number of records to skip, or <c>null</c> for no offset.</param>
+    /// <returns>The collection of matching <see cref="Domain.Entities.UserAccount"/> records.</returns>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task<IEnumerable<Domain.Entities.UserAccount>> GetAllAsync(
         int? limit,
         int? offset
@@ -48,6 +68,12 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         return users;
     }
 
+    /// <summary>
+    /// Updates a user account's username, first name, last name, email, and date of birth using
+    /// the <c>usp_UpdateUserAccount</c> stored procedure.
+    /// </summary>
+    /// <param name="userAccount">The user account containing updated values. Must have a valid <c>UserAccountId</c>.</param>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task UpdateAsync(Domain.Entities.UserAccount userAccount)
     {
         await using var connection = await CreateConnection();
@@ -65,6 +91,11 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         await command.ExecuteNonQueryAsync();
     }
 
+    /// <summary>
+    /// Deletes a user account by ID using the <c>usp_DeleteUserAccount</c> stored procedure.
+    /// </summary>
+    /// <param name="id">The unique identifier of the user account to delete.</param>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task DeleteAsync(Guid id)
     {
         await using var connection = await CreateConnection();
@@ -76,6 +107,12 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         await command.ExecuteNonQueryAsync();
     }
 
+    /// <summary>
+    /// Retrieves a user account by username using the <c>usp_GetUserAccountByUsername</c> stored procedure.
+    /// </summary>
+    /// <param name="username">The username to search for.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task<Domain.Entities.UserAccount?> GetByUsernameAsync(
         string username
     )
@@ -91,6 +128,12 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         return await reader.ReadAsync() ? MapToEntity(reader) : null;
     }
 
+    /// <summary>
+    /// Retrieves a user account by email address using the <c>usp_GetUserAccountByEmail</c> stored procedure.
+    /// </summary>
+    /// <param name="email">The email address to search for.</param>
+    /// <returns>The matching <see cref="Domain.Entities.UserAccount"/>, or <c>null</c> if not found.</returns>
+    /// <exception cref="Microsoft.Data.SqlClient.SqlException">Thrown when the database command fails.</exception>
     public async Task<Domain.Entities.UserAccount?> GetByEmailAsync(
         string email
     )
@@ -106,6 +149,11 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         return await reader.ReadAsync() ? MapToEntity(reader) : null;
     }
 
+    /// <summary>
+    /// Maps the current row of a data reader to a <see cref="Domain.Entities.UserAccount"/> entity.
+    /// </summary>
+    /// <param name="reader">The data reader positioned on the row to map.</param>
+    /// <returns>The mapped <see cref="Domain.Entities.UserAccount"/> instance.</returns>
     protected override Domain.Entities.UserAccount MapToEntity(
         DbDataReader reader
     )
@@ -128,6 +176,13 @@ public class UserAccountRepository(ISqlConnectionFactory connectionFactory)
         };
     }
 
+    /// <summary>
+    /// Helper method to add a parameter to a database command, converting <c>null</c> values to
+    /// <see cref="DBNull.Value"/>.
+    /// </summary>
+    /// <param name="command">The command to add the parameter to.</param>
+    /// <param name="name">The parameter name (including any prefix, e.g. "@Username").</param>
+    /// <param name="value">The parameter value, or <c>null</c> to bind <see cref="DBNull.Value"/>.</param>
     private static void AddParameter(
         DbCommand command,
         string name,