yep

Shogi.Api/Controllers/SessionsController.cs

@@ -39,7 +39,7 @@ public class SessionsController : ControllerBase
 	public async Task<IActionResult> CreateSession([FromBody] CreateSessionCommand request)
 	{
 		var userId = User.GetShogiUserId();
-		var session = new Domain.Aggregates.Session(request.Name, userId);
+		var session = new Domain.Session(request.Name, userId);
 		try
 		{
 			await sessionRepository.CreateSession(session);
@@ -126,7 +126,7 @@ public class SessionsController : ControllerBase
 			}
 			else
 			{
-				session.Board.Move(command.From!, command.To, command.IsPromotion);
+				session.Board.Move(command.From!, command.To, command.IsPromotion!.Value);
 			}
 		}
 		catch (InvalidOperationException)

Shogi.Api/Extensions/ContractsExtensions.cs

@@ -50,6 +50,7 @@ public static class ContractsExtensions
 	public static Dictionary<string, Piece?> ToContract(this ReadOnlyDictionary<string, Domain.ValueObjects.Piece?> boardState) =>
 		boardState.ToDictionary(kvp => kvp.Key, kvp => kvp.Value?.ToContract());
 
+	public static Domain.WhichPiece? ToDomain(this WhichPiece? piece) => piece.HasValue ? piece.Value.ToDomain() : null;
 	public static Domain.WhichPiece ToDomain(this WhichPiece piece)
 	{
 		return piece switch

Shogi.Api/Repositories/Dto/MoveDto.cs

@@ -5,6 +5,6 @@ namespace Shogi.Api.Repositories.Dto;
 /// <summary>
 /// Useful with Dapper to read from database.
 /// </summary>
-public readonly record struct MoveDto(string From, string To, bool IsPromotion, WhichPiece? PieceFromHand)
+public readonly record struct MoveDto(string? From, string To, bool? IsPromotion, WhichPiece? PieceFromHand)
 {
 }

Shogi.Api/Repositories/SessionRepository.cs

@@ -1,6 +1,7 @@
 using Dapper;
+using Shogi.Api.Extensions;
 using Shogi.Api.Repositories.Dto;
-using Shogi.Domain.Aggregates;
+using Shogi.Domain;
 using System.Data;
 using System.Data.SqlClient;
 
@@ -65,6 +66,15 @@ public class SessionRepository : ISessionRepository
 		}
 		return session;
 	}
+
+	public async Task CreateMove(string sessionName, Contracts.Api.MovePieceCommand command)
+	{
+		using var connection = new SqlConnection(connectionString);
+		await connection.ExecuteAsync(
+			"session.CreateMove",
+			new { },
+			commandType: CommandType.StoredProcedure);
+	}
 }
 
 public interface ISessionRepository