add brief for functions in db, implemet full group manipulation (except owner,color), some fixes

wsServer.go

@@ -30,7 +30,7 @@ func ServeWsConnection(responseWriter http.ResponseWriter, request *http.Request
 	defer closeConnection(&client, ignoreCache)
 	for {
 		var clientMessage map[string]any
-		err := wsjson.Read(ctx, connection, &clientMessage)
+		err = wsjson.Read(ctx, connection, &clientMessage)
 		if err != nil {
 			log.Printf("read error: %v", err)
 			return
@@ -137,7 +137,6 @@ func handleUnauthenticatedMessage(ctx context.Context, client *Client, clientMes
 
 	clientFromCache, err := CacheGetClientById(clientId)
 	if err != nil {
-		// Not in cache — load from database
 		dbClient := &Client{Id: clientId}
 		err = DbSetClientByIdWithoutGroups(ctx, dbClient)
 		if err != nil {
@@ -162,6 +161,7 @@ func handleUnauthenticatedMessage(ctx context.Context, client *Client, clientMes
 		clientFromCache = dbClient
 	}
 
+	clientFromCache.WsConn = client.WsConn
 	*client = *clientFromCache
 
 	for groupId, _ := range clientFromCache.Groups {