revamping domain

Shogi.Database/Session/Tables/Session.sql

@@ -1,12 +1,13 @@
 CREATE TABLE [session].[Session]
 (
 	Id			BIGINT NOT NULL PRIMARY KEY IDENTITY,
-	[Name]		[session].[SessionName] NOT NULL UNIQUE,
 	Created		DATETIMEOFFSET NOT NULL DEFAULT SYSDATETIMEOFFSET(),
-	GameOver	BIT NOT NULL DEFAULT 0,
+	DomainDocument	[session].[JsonDocument] NOT NULL,
+	[Name]		AS JSON_VALUE(DomainDocument, '$.Name') UNIQUE,
 	Player1Id	BIGINT NOT NULL,
 	Player2Id	BIGINT NULL,
 
+	CONSTRAINT [BoardState must be json] CHECK (isjson(DomainDocument)=1),
 	CONSTRAINT FK_Player1_User FOREIGN KEY (Player1Id) REFERENCES [user].[User] (Id) 
 		ON DELETE CASCADE 
 		ON UPDATE CASCADE,