yep

Shogi.Database/Session/Stored Procedures/CreateSession.sql

@@ -1,14 +1,14 @@
 CREATE PROCEDURE [session].[CreateSession]
-	@InitialBoardStateDocument [session].[JsonDocument]
+	@InitialBoardStateDocument [session].[JsonDocument],
+	@Player1Name [user].[UserName]
 AS
 BEGIN
 	SET NOCOUNT ON
 
-	INSERT INTO [session].[Session] ([Name], BoardState, Player1Id)
+	INSERT INTO [session].[Session] (BoardState, Player1Id)
 	SELECT
-		JSON_VALUE(@InitialBoardStateDocument, '$.Name'),
 		@InitialBoardStateDocument,
 		Id
 	FROM [user].[User]
-	WHERE [Name] = JSON_VALUE(@InitialBoardStateDocument, '$.Player1');
+	WHERE [Name] = @Player1Name
 END

Shogi.Database/Session/Stored Procedures/ReadSession.sql

@@ -6,7 +6,6 @@ BEGIN
 
 	SELECT
 		sess.[Name],
-		GameOver,
 		BoardState,
 		p1.[Name] as Player1,
 		p2.[Name] as Player2

Shogi.Database/Session/Tables/Session.sql

@@ -2,12 +2,12 @@
 (
 	Id			BIGINT NOT NULL PRIMARY KEY IDENTITY,
 	Created		DATETIMEOFFSET NOT NULL DEFAULT SYSDATETIMEOFFSET(),
-	DomainDocument	[session].[JsonDocument] NOT NULL,
-	[Name]		AS JSON_VALUE(DomainDocument, '$.Name') UNIQUE,
 	Player1Id	BIGINT NOT NULL,
 	Player2Id	BIGINT NULL,
+	BoardState	[session].[JsonDocument] NOT NULL,
+	[Name]		AS JSON_VALUE(BoardState, '$.Name') UNIQUE,
 
-	CONSTRAINT [BoardState must be json] CHECK (isjson(DomainDocument)=1),
+	CONSTRAINT [BoardState must be json] CHECK (isjson(BoardState)=1),
 	CONSTRAINT FK_Player1_User FOREIGN KEY (Player1Id) REFERENCES [user].[User] (Id) 
 		ON DELETE CASCADE 
 		ON UPDATE CASCADE,