yep

Shogi.Sockets/Repositories/Dto/BoardStateDto.cs

@@ -0,0 +1,22 @@
+using Shogi.Domain;
+using Shogi.Domain.ValueObjects;
+using System.Collections.ObjectModel;
+
+namespace Shogi.Api.Repositories.Dto;
+
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+public class BoardStateDto
+{
+	public ReadOnlyDictionary<string, Piece?> State { get; set; }
+
+	public List<Piece> Player1Hand { get; set; }
+
+	public List<Piece> Player2Hand { get; set; }
+
+	public Move PreviousMove { get; }
+
+	public WhichPlayer WhoseTurn { get; set; }
+	public WhichPlayer? InCheck { get; set; }
+	public bool IsCheckmate { get; set; }
+}
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

Shogi.Sockets/Repositories/Dto/SessionDto.cs

@@ -1,14 +1,14 @@
-namespace Shogi.Api.Repositories.Dto
+namespace Shogi.Api.Repositories.Dto;
+
+/// <summary>
+/// Useful with Dapper to read from database.
+/// </summary>
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+public class SessionDto
 {
-	/// <summary>
-	/// Useful with Dapper to read from database.
-	/// </summary>
-	public class SessionDto
-	{
-		public string Name { get; set; }
-		public string Player1 { get; set; }
-		public string Player2 { get; set; }
-		public bool GameOver { get; set; }
-		public string BoardState { get; set; }
-	}
+	public string Name { get; set; }
+	public string Player1 { get; set; }
+	public string Player2 { get; set; }
+	public BoardStateDto BoardState { get; set; }
 }
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

Shogi.Sockets/Repositories/QueryRepository.cs

@@ -21,19 +21,9 @@ public class QueryRepository : IQueryRespository
 			"session.ReadAllSessionsMetadata",
 			commandType: System.Data.CommandType.StoredProcedure);
 	}
-
-	public async Task<SessionMetadata?> ReadSession(string name)
-	{
-		using var connection = new SqlConnection(connectionString);
-		var results = await connection.QueryAsync<SessionDto>(
-			"session.ReadSession",
-			commandType: System.Data.CommandType.StoredProcedure);
-		return results.SingleOrDefault();
-	}
 }
 
 public interface IQueryRespository
 {
 	Task<IEnumerable<SessionMetadata>> ReadAllSessionsMetadata();
-	Task<SessionMetadata?> ReadSession(string name);
 }

Shogi.Sockets/Repositories/SessionRepository.cs

@@ -1,6 +1,8 @@
 using Dapper;
 using Shogi.Api.Repositories.Dto;
 using Shogi.Domain;
+using Shogi.Domain.Aggregates;
+using Shogi.Domain.ValueObjects;
 using System.Data;
 using System.Data.SqlClient;
 using System.Text.Json;
@@ -16,22 +18,53 @@ public class SessionRepository : ISessionRepository
 		connectionString = configuration.GetConnectionString("ShogiDatabase");
 	}
 
-	public async Task CreateSession(ShogiBoard session, string player1)
+	public async Task CreateSession(Session session)
 	{
-		var initialBoardState = JsonSerializer.Serialize(session.BoardState);
+		var boardStateDto = new BoardStateDto
+		{
+			InCheck = session.BoardState.InCheck,
+			IsCheckmate = session.BoardState.IsCheckmate,
+			Player1Hand = session.BoardState.Player1Hand,
+			Player2Hand = session.BoardState.Player2Hand,
+			State = session.BoardState.State,
+			WhoseTurn = session.BoardState.WhoseTurn,
+		};
+
 		using var connection = new SqlConnection(connectionString);
 		await connection.ExecuteAsync(
 			"session.CreateSession",
 			new
 			{
-				InitialBoardStateDocument = initialBoardState,
+				Name = sessionName,
+				InitialBoardStateDocument = JsonSerializer.Serialize(boardStateDto),
 				Player1Name = player1,
 			},
 			commandType: CommandType.StoredProcedure);
 	}
+
+	public async Task<ShogiBoard?> ReadShogiBoard(string name)
+	{
+		using var connection = new SqlConnection(connectionString);
+		var results = await connection.QueryAsync<SessionDto>(
+			"session.ReadSession",
+			commandType: CommandType.StoredProcedure);
+		var dto = results.SingleOrDefault();
+		if (dto == null) return null;
+
+		var boardState = new BoardState(
+			state: new(dto.BoardState.State),
+			player1Hand: dto.BoardState.Player1Hand,
+			player2Hand: dto.BoardState.Player2Hand,
+			whoseTurn: dto.BoardState.WhoseTurn,
+			playerInCheck: dto.BoardState.InCheck,
+			previousMove: dto.BoardState.PreviousMove);
+		var session = new ShogiBoard(boardState);
+		return session;
+	}
 }
 
 public interface ISessionRepository
 {
-	Task CreateSession(ShogiBoard session, string player1);
+	Task CreateSession(Session session);
+	Task<ShogiBoard?> ReadShogiBoard(string name);
 }