fix: improve trading and UI

api/server.go

@@ -132,6 +132,7 @@ func (s *Server) setupRoutes() {
 			protected.PUT("/traders/:id/prompt", s.handleUpdateTraderPrompt)
 			protected.POST("/traders/:id/sync-balance", s.handleSyncBalance)
 			protected.POST("/traders/:id/close-position", s.handleClosePosition)
+			protected.PUT("/traders/:id/competition", s.handleToggleCompetition)
 
 			// AI model configuration
 			protected.GET("/models", s.handleGetModelConfigs)
@@ -351,7 +352,8 @@ type CreateTraderRequest struct {
 	StrategyID          string  `json:"strategy_id"` // Strategy ID (new version)
 	InitialBalance      float64 `json:"initial_balance"`
 	ScanIntervalMinutes int     `json:"scan_interval_minutes"`
-	IsCrossMargin       *bool   `json:"is_cross_margin"` // Pointer type, nil means use default value true
+	IsCrossMargin       *bool   `json:"is_cross_margin"`     // Pointer type, nil means use default value true
+	ShowInCompetition   *bool   `json:"show_in_competition"` // Pointer type, nil means use default value true
 	// The following fields are kept for backward compatibility, new version uses strategy config
 	BTCETHLeverage       int    `json:"btc_eth_leverage"`
 	AltcoinLeverage      int    `json:"altcoin_leverage"`
@@ -394,17 +396,17 @@ type ExchangeConfig struct {
 
 // SafeExchangeConfig Safe exchange configuration structure (does not contain sensitive information)
 type SafeExchangeConfig struct {
-	ID                    string `json:"id"`                      // UUID
+	ID                    string `json:"id"`            // UUID
-	ExchangeType          string `json:"exchange_type"`           // "binance", "bybit", "okx", "hyperliquid", "aster", "lighter"
+	ExchangeType          string `json:"exchange_type"` // "binance", "bybit", "okx", "hyperliquid", "aster", "lighter"
-	AccountName           string `json:"account_name"`            // User-defined account name
+	AccountName           string `json:"account_name"`  // User-defined account name
-	Name                  string `json:"name"`                    // Display name
+	Name                  string `json:"name"`          // Display name
-	Type                  string `json:"type"`                    // "cex" or "dex"
+	Type                  string `json:"type"`          // "cex" or "dex"
 	Enabled               bool   `json:"enabled"`
 	Testnet               bool   `json:"testnet,omitempty"`
-	HyperliquidWalletAddr string `json:"hyperliquidWalletAddr"`   // Hyperliquid wallet address (not sensitive)
+	HyperliquidWalletAddr string `json:"hyperliquidWalletAddr"` // Hyperliquid wallet address (not sensitive)
-	AsterUser             string `json:"asterUser"`               // Aster username (not sensitive)
+	AsterUser             string `json:"asterUser"`             // Aster username (not sensitive)
-	AsterSigner           string `json:"asterSigner"`             // Aster signer (not sensitive)
+	AsterSigner           string `json:"asterSigner"`           // Aster signer (not sensitive)
-	LighterWalletAddr     string `json:"lighterWalletAddr"`       // LIGHTER wallet address (not sensitive)
+	LighterWalletAddr     string `json:"lighterWalletAddr"`     // LIGHTER wallet address (not sensitive)
 }
 
 type UpdateModelConfigRequest struct {
@@ -477,6 +479,11 @@ func (s *Server) handleCreateTrader(c *gin.Context) {
 		isCrossMargin = *req.IsCrossMargin
 	}
 
+	showInCompetition := true // Default to show in competition
+	if req.ShowInCompetition != nil {
+		showInCompetition = *req.ShowInCompetition
+	}
+
 	// Set leverage default values
 	btcEthLeverage := 10 // Default value
 	altcoinLeverage := 5 // Default value
@@ -615,6 +622,7 @@ func (s *Server) handleCreateTrader(c *gin.Context) {
 		OverrideBasePrompt:   req.OverrideBasePrompt,
 		SystemPromptTemplate: systemPromptTemplate,
 		IsCrossMargin:        isCrossMargin,
+		ShowInCompetition:    showInCompetition,
 		ScanIntervalMinutes:  scanIntervalMinutes,
 		IsRunning:            false,
 	}
@@ -657,6 +665,7 @@ type UpdateTraderRequest struct {
 	InitialBalance      float64 `json:"initial_balance"`
 	ScanIntervalMinutes int     `json:"scan_interval_minutes"`
 	IsCrossMargin       *bool   `json:"is_cross_margin"`
+	ShowInCompetition   *bool   `json:"show_in_competition"`
 	// The following fields are kept for backward compatibility, new version uses strategy config
 	BTCETHLeverage       int    `json:"btc_eth_leverage"`
 	AltcoinLeverage      int    `json:"altcoin_leverage"`
@@ -703,6 +712,11 @@ func (s *Server) handleUpdateTrader(c *gin.Context) {
 		isCrossMargin = *req.IsCrossMargin
 	}
 
+	showInCompetition := existingTrader.ShowInCompetition // Keep original value
+	if req.ShowInCompetition != nil {
+		showInCompetition = *req.ShowInCompetition
+	}
+
 	// Set leverage default values
 	btcEthLeverage := req.BTCETHLeverage
 	altcoinLeverage := req.AltcoinLeverage
@@ -749,6 +763,7 @@ func (s *Server) handleUpdateTrader(c *gin.Context) {
 		OverrideBasePrompt:   req.OverrideBasePrompt,
 		SystemPromptTemplate: systemPromptTemplate,
 		IsCrossMargin:        isCrossMargin,
+		ShowInCompetition:    showInCompetition,
 		ScanIntervalMinutes:  scanIntervalMinutes,
 		IsRunning:            existingTrader.IsRunning, // Keep original value
 	}
@@ -956,6 +971,43 @@ func (s *Server) handleUpdateTraderPrompt(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "Custom prompt updated"})
 }
 
+// handleToggleCompetition Toggle trader competition visibility
+func (s *Server) handleToggleCompetition(c *gin.Context) {
+	traderID := c.Param("id")
+	userID := c.GetString("user_id")
+
+	var req struct {
+		ShowInCompetition bool `json:"show_in_competition"`
+	}
+
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Update database
+	err := s.store.Trader().UpdateShowInCompetition(userID, traderID, req.ShowInCompetition)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to update competition visibility: %v", err)})
+		return
+	}
+
+	// Update in-memory trader if it exists
+	if trader, err := s.traderManager.GetTrader(traderID); err == nil {
+		trader.SetShowInCompetition(req.ShowInCompetition)
+	}
+
+	status := "shown"
+	if !req.ShowInCompetition {
+		status = "hidden"
+	}
+	logger.Infof("✓ Trader %s competition visibility updated: %s", traderID, status)
+	c.JSON(http.StatusOK, gin.H{
+		"message":             "Competition visibility updated",
+		"show_in_competition": req.ShowInCompetition,
+	})
+}
+
 // handleSyncBalance Sync exchange balance to initial_balance (Option B: Manual Sync + Option C: Smart Detection)
 func (s *Server) handleSyncBalance(c *gin.Context) {
 	userID := c.GetString("user_id")
@@ -1554,8 +1606,8 @@ func (s *Server) handleDeleteExchange(c *gin.Context) {
 	for _, trader := range traders {
 		if trader.ExchangeID == exchangeID {
 			c.JSON(http.StatusBadRequest, gin.H{
-				"error":     "Cannot delete exchange account that is in use by traders",
+				"error":       "Cannot delete exchange account that is in use by traders",
-				"trader_id": trader.ID,
+				"trader_id":   trader.ID,
 				"trader_name": trader.Name,
 			})
 			return
@@ -1605,14 +1657,15 @@ func (s *Server) handleTraderList(c *gin.Context) {
 		// Return complete AIModelID (e.g. "admin_deepseek"), don't truncate
 		// Frontend needs complete ID to verify model exists (consistent with handleGetTraderConfig)
 		result = append(result, map[string]interface{}{
-			"trader_id":       trader.ID,
+			"trader_id":           trader.ID,
-			"trader_name":     trader.Name,
+			"trader_name":         trader.Name,
-			"ai_model":        trader.AIModelID, // Use complete ID
+			"ai_model":            trader.AIModelID, // Use complete ID
-			"exchange_id":     trader.ExchangeID,
+			"exchange_id":         trader.ExchangeID,
-			"is_running":      isRunning,
+			"is_running":          isRunning,
-			"initial_balance": trader.InitialBalance,
+			"show_in_competition": trader.ShowInCompetition,
-			"strategy_id":     trader.StrategyID,
+			"initial_balance":     trader.InitialBalance,
-			"strategy_name":   strategyName,
+			"strategy_id":         trader.StrategyID,
+			"strategy_name":       strategyName,
 		})
 	}
 
@@ -1989,6 +2042,20 @@ func (s *Server) handleRegister(c *gin.Context) {
 		return
 	}
 
+	// Check max users limit
+	maxUsers := config.Get().MaxUsers
+	if maxUsers > 0 {
+		userCount, err := s.store.User().Count()
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to check user count"})
+			return
+		}
+		if userCount >= maxUsers {
+			c.JSON(http.StatusForbidden, gin.H{"error": "Not on whitelist"})
+			return
+		}
+	}
+
 	var req struct {
 		Email    string `json:"email" binding:"required,email"`
 		Password string `json:"password" binding:"required,min=6"`

config/config.go

@@ -16,6 +16,7 @@ type Config struct {
 	APIServerPort       int
 	JWTSecret           string
 	RegistrationEnabled bool
+	MaxUsers            int // Maximum number of users allowed (0 = unlimited, default = 1)
 
 	// Security configuration
 	// TransportEncryption enables browser-side encryption for API keys
@@ -28,6 +29,7 @@ func Init() {
 	cfg := &Config{
 		APIServerPort:       8080,
 		RegistrationEnabled: true,
+		MaxUsers:            1, // Default: only 1 user allowed
 	}
 
 	// Load from environment variables
@@ -42,6 +44,12 @@ func Init() {
 		cfg.RegistrationEnabled = strings.ToLower(v) == "true"
 	}
 
+	if v := os.Getenv("MAX_USERS"); v != "" {
+		if maxUsers, err := strconv.Atoi(v); err == nil && maxUsers >= 0 {
+			cfg.MaxUsers = maxUsers
+		}
+	}
+
 	if v := os.Getenv("API_SERVER_PORT"); v != "" {
 		if port, err := strconv.Atoi(v); err == nil && port > 0 {
 			cfg.APIServerPort = port

manager/trader_manager.go

@@ -196,11 +196,15 @@ func (tm *TraderManager) GetCompetitionData() (map[string]interface{}, error) {
 
 	tm.mu.RLock()
 
-	// Get all trader list
+	// Get all trader list (only those with ShowInCompetition = true)
 	allTraders := make([]*trader.AutoTrader, 0, len(tm.traders))
 	for id, t := range tm.traders {
-		allTraders = append(allTraders, t)
+		if t.GetShowInCompetition() {
-		logger.Infof("📋 Competition data includes trader: %s (%s)", t.GetName(), id)
+			allTraders = append(allTraders, t)
+			logger.Infof("📋 Competition data includes trader: %s (%s)", t.GetName(), id)
+		} else {
+			logger.Infof("📋 Competition data excludes trader (hidden): %s (%s)", t.GetName(), id)
+		}
 	}
 	tm.mu.RUnlock()
 
@@ -616,10 +620,11 @@ func (tm *TraderManager) addTraderFromStore(traderCfg *store.Trader, aiModelCfg
 		QwenKey:               "",
 		CustomAPIURL:          aiModelCfg.CustomAPIURL,
 		CustomModelName:       aiModelCfg.CustomModelName,
-		ScanInterval:    time.Duration(traderCfg.ScanIntervalMinutes) * time.Minute,
+		ScanInterval:         time.Duration(traderCfg.ScanIntervalMinutes) * time.Minute,
-		InitialBalance:  traderCfg.InitialBalance,
+		InitialBalance:       traderCfg.InitialBalance,
-		IsCrossMargin:   traderCfg.IsCrossMargin,
+		IsCrossMargin:        traderCfg.IsCrossMargin,
-		StrategyConfig:        strategyConfig,
+		ShowInCompetition:    traderCfg.ShowInCompetition,
+		StrategyConfig:       strategyConfig,
 	}
 
 	// Set API keys based on exchange type

store/trader.go

@@ -24,6 +24,7 @@ type Trader struct {
 	ScanIntervalMinutes int       `json:"scan_interval_minutes"`
 	IsRunning           bool      `json:"is_running"`
 	IsCrossMargin       bool      `json:"is_cross_margin"`
+	ShowInCompetition   bool      `json:"show_in_competition"`   // Whether to show in competition page
 	CreatedAt           time.Time `json:"created_at"`
 	UpdatedAt           time.Time `json:"updated_at"`
 
@@ -98,6 +99,7 @@ func (s *TraderStore) initTables() error {
 		`ALTER TABLE traders ADD COLUMN use_oi_top BOOLEAN DEFAULT 0`,
 		`ALTER TABLE traders ADD COLUMN system_prompt_template TEXT DEFAULT 'default'`,
 		`ALTER TABLE traders ADD COLUMN strategy_id TEXT DEFAULT ''`,
+		`ALTER TABLE traders ADD COLUMN show_in_competition BOOLEAN DEFAULT 1`,
 	}
 	for _, q := range alterQueries {
 		s.db.Exec(q)
@@ -196,12 +198,12 @@ func (s *TraderStore) decrypt(encrypted string) string {
 func (s *TraderStore) Create(trader *Trader) error {
 	_, err := s.db.Exec(`
 		INSERT INTO traders (id, user_id, name, ai_model_id, exchange_id, strategy_id, initial_balance,
-		                     scan_interval_minutes, is_running, is_cross_margin,
+		                     scan_interval_minutes, is_running, is_cross_margin, show_in_competition,
 		                     btc_eth_leverage, altcoin_leverage, trading_symbols, use_coin_pool,
 		                     use_oi_top, custom_prompt, override_base_prompt, system_prompt_template)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
 	`, trader.ID, trader.UserID, trader.Name, trader.AIModelID, trader.ExchangeID, trader.StrategyID,
-		trader.InitialBalance, trader.ScanIntervalMinutes, trader.IsRunning, trader.IsCrossMargin,
+		trader.InitialBalance, trader.ScanIntervalMinutes, trader.IsRunning, trader.IsCrossMargin, trader.ShowInCompetition,
 		trader.BTCETHLeverage, trader.AltcoinLeverage, trader.TradingSymbols, trader.UseCoinPool,
 		trader.UseOITop, trader.CustomPrompt, trader.OverrideBasePrompt, trader.SystemPromptTemplate)
 	return err
@@ -212,6 +214,7 @@ func (s *TraderStore) List(userID string) ([]*Trader, error) {
 	rows, err := s.db.Query(`
 		SELECT id, user_id, name, ai_model_id, exchange_id, COALESCE(strategy_id, ''),
 		       initial_balance, scan_interval_minutes, is_running, COALESCE(is_cross_margin, 1),
+		       COALESCE(show_in_competition, 1),
 		       COALESCE(btc_eth_leverage, 5), COALESCE(altcoin_leverage, 5), COALESCE(trading_symbols, ''),
 		       COALESCE(use_coin_pool, 0), COALESCE(use_oi_top, 0), COALESCE(custom_prompt, ''),
 		       COALESCE(override_base_prompt, 0), COALESCE(system_prompt_template, 'default'),
@@ -230,6 +233,7 @@ func (s *TraderStore) List(userID string) ([]*Trader, error) {
 		err := rows.Scan(
 			&t.ID, &t.UserID, &t.Name, &t.AIModelID, &t.ExchangeID, &t.StrategyID,
 			&t.InitialBalance, &t.ScanIntervalMinutes, &t.IsRunning, &t.IsCrossMargin,
+			&t.ShowInCompetition,
 			&t.BTCETHLeverage, &t.AltcoinLeverage, &t.TradingSymbols,
 			&t.UseCoinPool, &t.UseOITop, &t.CustomPrompt, &t.OverrideBasePrompt,
 			&t.SystemPromptTemplate, &createdAt, &updatedAt,
@@ -250,16 +254,22 @@ func (s *TraderStore) UpdateStatus(userID, id string, isRunning bool) error {
 	return err
 }
 
+// UpdateShowInCompetition updates trader competition visibility
+func (s *TraderStore) UpdateShowInCompetition(userID, id string, showInCompetition bool) error {
+	_, err := s.db.Exec(`UPDATE traders SET show_in_competition = ? WHERE id = ? AND user_id = ?`, showInCompetition, id, userID)
+	return err
+}
+
 // Update updates trader configuration
 func (s *TraderStore) Update(trader *Trader) error {
 	_, err := s.db.Exec(`
 		UPDATE traders SET
 			name = ?, ai_model_id = ?, exchange_id = ?, strategy_id = ?,
-			scan_interval_minutes = ?, is_cross_margin = ?,
+			scan_interval_minutes = ?, is_cross_margin = ?, show_in_competition = ?,
 			updated_at = CURRENT_TIMESTAMP
 		WHERE id = ? AND user_id = ?
 	`, trader.Name, trader.AIModelID, trader.ExchangeID, trader.StrategyID,
-		trader.ScanIntervalMinutes, trader.IsCrossMargin, trader.ID, trader.UserID)
+		trader.ScanIntervalMinutes, trader.IsCrossMargin, trader.ShowInCompetition, trader.ID, trader.UserID)
 	return err
 }
 
@@ -453,6 +463,7 @@ func (s *TraderStore) ListAll() ([]*Trader, error) {
 	rows, err := s.db.Query(`
 		SELECT id, user_id, name, ai_model_id, exchange_id, COALESCE(strategy_id, ''),
 		       initial_balance, scan_interval_minutes, is_running, COALESCE(is_cross_margin, 1),
+		       COALESCE(show_in_competition, 1),
 		       COALESCE(btc_eth_leverage, 5), COALESCE(altcoin_leverage, 5), COALESCE(trading_symbols, ''),
 		       COALESCE(use_coin_pool, 0), COALESCE(use_oi_top, 0), COALESCE(custom_prompt, ''),
 		       COALESCE(override_base_prompt, 0), COALESCE(system_prompt_template, 'default'),
@@ -471,6 +482,7 @@ func (s *TraderStore) ListAll() ([]*Trader, error) {
 		err := rows.Scan(
 			&t.ID, &t.UserID, &t.Name, &t.AIModelID, &t.ExchangeID, &t.StrategyID,
 			&t.InitialBalance, &t.ScanIntervalMinutes, &t.IsRunning, &t.IsCrossMargin,
+			&t.ShowInCompetition,
 			&t.BTCETHLeverage, &t.AltcoinLeverage, &t.TradingSymbols,
 			&t.UseCoinPool, &t.UseOITop, &t.CustomPrompt, &t.OverrideBasePrompt,
 			&t.SystemPromptTemplate, &createdAt, &updatedAt,

store/user.go

@@ -111,6 +111,13 @@ func (s *UserStore) GetByID(userID string) (*User, error) {
 	return &user, nil
 }
 
+// Count returns the total number of users
+func (s *UserStore) Count() (int, error) {
+	var count int
+	err := s.db.QueryRow(`SELECT COUNT(*) FROM users`).Scan(&count)
+	return count, err
+}
+
 // GetAllIDs gets all user IDs
 func (s *UserStore) GetAllIDs() ([]string, error) {
 	rows, err := s.db.Query(`SELECT id FROM users ORDER BY id`)

trader/auto_trader.go

@@ -78,6 +78,9 @@ type AutoTraderConfig struct {
 	// Position mode
 	IsCrossMargin bool // true=cross margin mode, false=isolated margin mode
 
+	// Competition visibility
+	ShowInCompetition bool // Whether to show in competition page
+
 	// Strategy configuration (use complete strategy config)
 	StrategyConfig *store.StrategyConfig // Strategy configuration (includes coin sources, indicators, risk control, prompts, etc.)
 }
@@ -89,6 +92,7 @@ type AutoTrader struct {
 	aiModel               string // AI model name
 	exchange              string // Trading platform type (binance/bybit/etc)
 	exchangeID            string // Exchange account UUID
+	showInCompetition     bool   // Whether to show in competition page
 	config                AutoTraderConfig
 	trader                Trader // Use Trader interface (supports multiple platforms)
 	mcpClient             mcp.AIClient
@@ -275,6 +279,7 @@ func NewAutoTrader(config AutoTraderConfig, st *store.Store, userID string) (*Au
 		aiModel:               config.AIModel,
 		exchange:              config.Exchange,
 		exchangeID:            config.ExchangeID,
+		showInCompetition:     config.ShowInCompetition,
 		config:                config,
 		trader:                trader,
 		mcpClient:             mcpClient,
@@ -810,31 +815,32 @@ func (at *AutoTrader) executeOpenLongWithRecord(decision *decision.Decision, act
 		decision.PositionSizeUSD = adjustedPositionSize
 	}
 
+	// ⚠️ Auto-adjust position size if insufficient margin
+	// Formula: totalRequired = positionSize/leverage + positionSize*0.001 + positionSize/leverage*0.01
+	//        = positionSize * (1.01/leverage + 0.001)
+	marginFactor := 1.01/float64(decision.Leverage) + 0.001
+	maxAffordablePositionSize := availableBalance / marginFactor
+
+	actualPositionSize := decision.PositionSizeUSD
+	if actualPositionSize > maxAffordablePositionSize {
+		// Use 98% of max to leave buffer for price fluctuation
+		adjustedSize := maxAffordablePositionSize * 0.98
+		logger.Infof("  ⚠️ Position size %.2f exceeds max affordable %.2f, auto-reducing to %.2f",
+			actualPositionSize, maxAffordablePositionSize, adjustedSize)
+		actualPositionSize = adjustedSize
+		decision.PositionSizeUSD = actualPositionSize
+	}
+
 	// [CODE ENFORCED] Minimum position size check
 	if err := at.enforceMinPositionSize(decision.PositionSizeUSD); err != nil {
 		return err
 	}
 
-	// Calculate quantity
+	// Calculate quantity with adjusted position size
-	quantity := decision.PositionSizeUSD / marketData.CurrentPrice
+	quantity := actualPositionSize / marketData.CurrentPrice
 	actionRecord.Quantity = quantity
 	actionRecord.Price = marketData.CurrentPrice
 
-	// ⚠️ Margin validation: prevent insufficient margin error (code=-2019)
-	requiredMargin := decision.PositionSizeUSD / float64(decision.Leverage)
-
-	// Fee estimation: use 0.1% (safety buffer over typical 0.04% taker fee)
-	// This accounts for: taker fee, slippage, funding rate, and exchange-specific variations (OKX needs more buffer)
-	estimatedFee := decision.PositionSizeUSD * 0.001
-	// Add 1% safety buffer for price fluctuation and rounding
-	safetyBuffer := requiredMargin * 0.01
-	totalRequired := requiredMargin + estimatedFee + safetyBuffer
-
-	if totalRequired > availableBalance {
-		return fmt.Errorf("❌ Insufficient margin: required %.2f USDT (margin %.2f + fee %.2f + buffer %.2f), available %.2f USDT",
-			totalRequired, requiredMargin, estimatedFee, safetyBuffer, availableBalance)
-	}
-
 	// Set margin mode
 	if err := at.trader.SetMarginMode(decision.Symbol, at.config.IsCrossMargin); err != nil {
 		logger.Infof("  ⚠️ Failed to set margin mode: %v", err)
@@ -926,31 +932,32 @@ func (at *AutoTrader) executeOpenShortWithRecord(decision *decision.Decision, ac
 		decision.PositionSizeUSD = adjustedPositionSize
 	}
 
+	// ⚠️ Auto-adjust position size if insufficient margin
+	// Formula: totalRequired = positionSize/leverage + positionSize*0.001 + positionSize/leverage*0.01
+	//        = positionSize * (1.01/leverage + 0.001)
+	marginFactor := 1.01/float64(decision.Leverage) + 0.001
+	maxAffordablePositionSize := availableBalance / marginFactor
+
+	actualPositionSize := decision.PositionSizeUSD
+	if actualPositionSize > maxAffordablePositionSize {
+		// Use 98% of max to leave buffer for price fluctuation
+		adjustedSize := maxAffordablePositionSize * 0.98
+		logger.Infof("  ⚠️ Position size %.2f exceeds max affordable %.2f, auto-reducing to %.2f",
+			actualPositionSize, maxAffordablePositionSize, adjustedSize)
+		actualPositionSize = adjustedSize
+		decision.PositionSizeUSD = actualPositionSize
+	}
+
 	// [CODE ENFORCED] Minimum position size check
 	if err := at.enforceMinPositionSize(decision.PositionSizeUSD); err != nil {
 		return err
 	}
 
-	// Calculate quantity
+	// Calculate quantity with adjusted position size
-	quantity := decision.PositionSizeUSD / marketData.CurrentPrice
+	quantity := actualPositionSize / marketData.CurrentPrice
 	actionRecord.Quantity = quantity
 	actionRecord.Price = marketData.CurrentPrice
 
-	// ⚠️ Margin validation: prevent insufficient margin error (code=-2019)
-	requiredMargin := decision.PositionSizeUSD / float64(decision.Leverage)
-
-	// Fee estimation: use 0.1% (safety buffer over typical 0.04% taker fee)
-	// This accounts for: taker fee, slippage, funding rate, and exchange-specific variations (OKX needs more buffer)
-	estimatedFee := decision.PositionSizeUSD * 0.001
-	// Add 1% safety buffer for price fluctuation and rounding
-	safetyBuffer := requiredMargin * 0.01
-	totalRequired := requiredMargin + estimatedFee + safetyBuffer
-
-	if totalRequired > availableBalance {
-		return fmt.Errorf("❌ Insufficient margin: required %.2f USDT (margin %.2f + fee %.2f + buffer %.2f), available %.2f USDT",
-			totalRequired, requiredMargin, estimatedFee, safetyBuffer, availableBalance)
-	}
-
 	// Set margin mode
 	if err := at.trader.SetMarginMode(decision.Symbol, at.config.IsCrossMargin); err != nil {
 		logger.Infof("  ⚠️ Failed to set margin mode: %v", err)
@@ -1102,6 +1109,16 @@ func (at *AutoTrader) GetExchange() string {
 	return at.exchange
 }
 
+// GetShowInCompetition returns whether trader should be shown in competition
+func (at *AutoTrader) GetShowInCompetition() bool {
+	return at.showInCompetition
+}
+
+// SetShowInCompetition sets whether trader should be shown in competition
+func (at *AutoTrader) SetShowInCompetition(show bool) {
+	at.showInCompetition = show
+}
+
 // SetCustomPrompt sets custom trading strategy prompt
 func (at *AutoTrader) SetCustomPrompt(prompt string) {
 	at.customPrompt = prompt

web/src/components/AITradersPage.tsx

@@ -25,6 +25,8 @@ import {
   Plus,
   Users,
   Pencil,
+  Eye,
+  EyeOff,
 } from 'lucide-react'
 import { confirmToast } from '../lib/notify'
 import { toast } from 'sonner'
@@ -337,6 +339,23 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
     }
   }
 
+  const handleToggleCompetition = async (traderId: string, currentShowInCompetition: boolean) => {
+    try {
+      const newValue = !currentShowInCompetition
+      await toast.promise(api.toggleCompetition(traderId, newValue), {
+        loading: '正在更新…',
+        success: newValue ? '已在竞技场显示' : '已在竞技场隐藏',
+        error: '更新失败',
+      })
+
+      // Immediately refresh traders list to update status
+      await mutateTraders()
+    } catch (error) {
+      console.error('Failed to toggle competition visibility:', error)
+      toast.error(t('operationFailed', language))
+    }
+  }
+
   const handleModelClick = (modelId: string) => {
     if (!isModelInUse(modelId)) {
       setEditingModel(modelId)
@@ -1069,6 +1088,29 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
                         : t('start', language)}
                     </button>
 
+                    <button
+                      onClick={() => handleToggleCompetition(trader.trader_id, trader.show_in_competition ?? true)}
+                      className="px-2 md:px-3 py-1.5 md:py-2 rounded text-xs md:text-sm font-semibold transition-all hover:scale-105 whitespace-nowrap flex items-center gap-1"
+                      style={
+                        trader.show_in_competition !== false
+                          ? {
+                              background: 'rgba(14, 203, 129, 0.1)',
+                              color: '#0ECB81',
+                            }
+                          : {
+                              background: 'rgba(132, 142, 156, 0.1)',
+                              color: '#848E9C',
+                            }
+                      }
+                      title={trader.show_in_competition !== false ? '在竞技场显示' : '在竞技场隐藏'}
+                    >
+                      {trader.show_in_competition !== false ? (
+                        <Eye className="w-3 h-3 md:w-4 md:h-4" />
+                      ) : (
+                        <EyeOff className="w-3 h-3 md:w-4 md:h-4" />
+                      )}
+                    </button>
+
                     <button
                       onClick={() => handleDeleteTrader(trader.trader_id)}
                       className="px-2 md:px-3 py-1.5 md:py-2 rounded text-xs md:text-sm font-semibold transition-all hover:scale-105"

web/src/components/TraderConfigModal.tsx

@@ -32,6 +32,7 @@ interface FormState {
   exchange_id: string
   strategy_id: string
   is_cross_margin: boolean
+  show_in_competition: boolean
   scan_interval_minutes: number
   initial_balance?: number
 }
@@ -62,6 +63,7 @@ export function TraderConfigModal({
     exchange_id: '',
     strategy_id: '',
     is_cross_margin: true,
+    show_in_competition: true,
     scan_interval_minutes: 3,
   })
   const [isSaving, setIsSaving] = useState(false)
@@ -109,6 +111,7 @@ export function TraderConfigModal({
         exchange_id: availableExchanges[0]?.id || '',
         strategy_id: '',
         is_cross_margin: true,
+        show_in_competition: true,
         scan_interval_minutes: 3,
       })
     }
@@ -162,6 +165,7 @@ export function TraderConfigModal({
         exchange_id: formData.exchange_id,
         strategy_id: formData.strategy_id || undefined,
         is_cross_margin: formData.is_cross_margin,
+        show_in_competition: formData.show_in_competition,
         scan_interval_minutes: formData.scan_interval_minutes,
       }
 
@@ -439,6 +443,40 @@ export function TraderConfigModal({
                 </div>
               </div>
 
+              {/* Competition visibility */}
+              <div>
+                <label className="text-sm text-[#EAECEF] block mb-2">
+                  竞技场显示
+                </label>
+                <div className="flex gap-2">
+                  <button
+                    type="button"
+                    onClick={() => handleInputChange('show_in_competition', true)}
+                    className={`flex-1 px-3 py-2 rounded text-sm ${
+                      formData.show_in_competition
+                        ? 'bg-[#F0B90B] text-black'
+                        : 'bg-[#0B0E11] text-[#848E9C] border border-[#2B3139]'
+                    }`}
+                  >
+                    显示
+                  </button>
+                  <button
+                    type="button"
+                    onClick={() => handleInputChange('show_in_competition', false)}
+                    className={`flex-1 px-3 py-2 rounded text-sm ${
+                      !formData.show_in_competition
+                        ? 'bg-[#F0B90B] text-black'
+                        : 'bg-[#0B0E11] text-[#848E9C] border border-[#2B3139]'
+                    }`}
+                  >
+                    隐藏
+                  </button>
+                </div>
+                <p className="text-xs text-[#848E9C] mt-1">
+                  隐藏后将不在竞技场页面显示此交易员
+                </p>
+              </div>
+
               {/* Initial Balance (Edit mode only) */}
               {isEditMode && (
                 <div>

web/src/components/landing/HowItWorksSection.tsx

@@ -11,20 +11,20 @@ export default function HowItWorksSection({ language }: HowItWorksSectionProps)
     {
       icon: Download,
       number: '01',
-      title: language === 'zh' ? '克隆项目' : 'Clone Project',
+      title: language === 'zh' ? '一键部署' : 'One-Click Deploy',
       desc: language === 'zh'
-        ? 'git clone 项目到本地'
+        ? '在你的服务器上运行一条命令即可完成部署'
-        : 'git clone the project locally',
+        : 'Run a single command on your server to deploy',
-      code: 'git clone https://github.com/NoFxAiOS/nofx.git',
+      code: 'curl -fsSL https://raw.githubusercontent.com/NoFxAiOS/nofx/main/install.sh | bash',
     },
     {
       icon: Rocket,
       number: '02',
-      title: language === 'zh' ? '启动服务' : 'Start Service',
+      title: language === 'zh' ? '访问面板' : 'Access Dashboard',
       desc: language === 'zh'
-        ? 'Docker 一键启动所有服务'
+        ? '通过浏览器访问你的服务器'
-        : 'Docker one-click start all services',
+        : 'Access your server via browser',
-      code: './start.sh start --build',
+      code: 'http://YOUR_SERVER_IP:3000',
     },
     {
       icon: TrendingUp,
@@ -33,7 +33,7 @@ export default function HowItWorksSection({ language }: HowItWorksSectionProps)
       desc: language === 'zh'
         ? '创建交易员，让 AI 开始工作'
         : 'Create trader, let AI do the work',
-      code: 'http://localhost:3000',
+      code: language === 'zh' ? '配置模型 → 配置交易所 → 创建交易员' : 'Configure Model → Exchange → Create Trader',
     },
   ]
 

web/src/components/traders/sections/TradersGrid.tsx

@@ -1,4 +1,4 @@
-import { Bot, BarChart3, Trash2, Pencil } from 'lucide-react'
+import { Bot, BarChart3, Trash2, Pencil, Eye, EyeOff } from 'lucide-react'
 import { t, type Language } from '../../../i18n/translations'
 import { getModelDisplayName } from '../index'
 import type { TraderInfo, Exchange } from '../../../types'
@@ -12,6 +12,7 @@ interface TradersGridProps {
   onEditTrader: (traderId: string) => void
   onDeleteTrader: (traderId: string) => void
   onToggleTrader: (traderId: string, running: boolean) => void
+  onToggleCompetition?: (traderId: string, showInCompetition: boolean) => void
 }
 
 export function TradersGrid({
@@ -22,6 +23,7 @@ export function TradersGrid({
   onEditTrader,
   onDeleteTrader,
   onToggleTrader,
+  onToggleCompetition,
 }: TradersGridProps) {
   // Helper function to get exchange display name
   const getExchangeDisplayName = (exchangeId: string | undefined) => {
@@ -166,6 +168,31 @@ export function TradersGrid({
                 {trader.is_running ? t('stop', language) : t('start', language)}
               </button>
 
+              {onToggleCompetition && (
+                <button
+                  onClick={() => onToggleCompetition(trader.trader_id, trader.show_in_competition ?? true)}
+                  className="px-2 md:px-3 py-1.5 md:py-2 rounded text-xs md:text-sm font-semibold transition-all hover:scale-105 whitespace-nowrap flex items-center gap-1"
+                  style={
+                    trader.show_in_competition !== false
+                      ? {
+                          background: 'rgba(14, 203, 129, 0.1)',
+                          color: '#0ECB81',
+                        }
+                      : {
+                          background: 'rgba(132, 142, 156, 0.1)',
+                          color: '#848E9C',
+                        }
+                  }
+                  title={trader.show_in_competition !== false ? '在竞技场显示' : '在竞技场隐藏'}
+                >
+                  {trader.show_in_competition !== false ? (
+                    <Eye className="w-3 h-3 md:w-4 md:h-4" />
+                  ) : (
+                    <EyeOff className="w-3 h-3 md:w-4 md:h-4" />
+                  )}
+                </button>
+              )}
+
               <button
                 onClick={() => onDeleteTrader(trader.trader_id)}
                 className="px-2 md:px-3 py-1.5 md:py-2 rounded text-xs md:text-sm font-semibold transition-all hover:scale-105"

web/src/hooks/useTraderActions.ts

@@ -242,6 +242,23 @@ export function useTraderActions({
     }
   }
 
+  const handleToggleCompetition = async (traderId: string, currentShowInCompetition: boolean) => {
+    try {
+      const newValue = !currentShowInCompetition
+      await toast.promise(api.toggleCompetition(traderId, newValue), {
+        loading: '正在更新…',
+        success: newValue ? '已在竞技场显示' : '已在竞技场隐藏',
+        error: '更新失败',
+      })
+
+      // Immediately refresh traders list to update status
+      await mutateTraders()
+    } catch (error) {
+      console.error('Failed to toggle competition visibility:', error)
+      toast.error(t('operationFailed', language))
+    }
+  }
+
   const handleModelClick = (modelId: string) => {
     if (!isModelInUse(modelId)) {
       setEditingModel(modelId)
@@ -619,6 +636,7 @@ export function useTraderActions({
     handleSaveEditTrader,
     handleDeleteTrader,
     handleToggleTrader,
+    handleToggleCompetition,
     handleAddModel,
     handleAddExchange,
     handleModelClick,

web/src/lib/api.ts

@@ -103,6 +103,14 @@ export const api = {
     if (!result.success) throw new Error('停止交易员失败')
   },
 
+  async toggleCompetition(traderId: string, showInCompetition: boolean): Promise<void> {
+    const result = await httpClient.put(
+      `${API_BASE}/traders/${traderId}/competition`,
+      { show_in_competition: showInCompetition }
+    )
+    if (!result.success) throw new Error('更新竞技场显示设置失败')
+  },
+
   async closePosition(traderId: string, symbol: string, side: string): Promise<{ message: string }> {
     const result = await httpClient.post<{ message: string }>(
       `${API_BASE}/traders/${traderId}/close-position`,

web/src/types.ts

@@ -91,6 +91,7 @@ export interface TraderInfo {
   ai_model: string
   exchange_id?: string
   is_running?: boolean
+  show_in_competition?: boolean
   strategy_id?: string
   strategy_name?: string
   custom_prompt?: string
@@ -157,6 +158,7 @@ export interface CreateTraderRequest {
   initial_balance?: number // 可选：创建时由后端自动获取，编辑时可手动更新
   scan_interval_minutes?: number
   is_cross_margin?: boolean
+  show_in_competition?: boolean // 是否在竞技场显示
   // 以下字段为向后兼容保留，新版使用策略配置
   btc_eth_leverage?: number
   altcoin_leverage?: number
@@ -229,6 +231,7 @@ export interface TraderConfigData {
   strategy_id?: string  // 策略ID
   strategy_name?: string  // 策略名称
   is_cross_margin: boolean
+  show_in_competition: boolean  // 是否在竞技场显示
   scan_interval_minutes: number
   initial_balance: number
   is_running: boolean