Add trading signal and execution layers with database integration

- Introduced `TradingSignalLayer` and `TradeExecutionLayer` for visualizing buy/sell signals and trade entries/exits on charts.
- Implemented signal validation and filtering mechanisms to ensure data integrity and user-configurable options.
- Enhanced market data layout to support new timeframes for improved user experience.
- Updated documentation to reflect the new signal layer architecture and its integration with the dashboard.
- Ensured compatibility with existing components while maintaining a modular structure for future enhancements.

components/charts/layers/__init__.py

@@ -14,6 +14,8 @@ Components:
 - BollingerBandsLayer: Bollinger Bands overlay with fill area
 - RSILayer: RSI oscillator subplot
 - MACDLayer: MACD lines and histogram subplot
+- TradingSignalLayer: Buy/sell/hold signal markers
+- TradeExecutionLayer: Trade entry/exit point visualization
 """
 
 from .base import (
@@ -47,6 +49,22 @@ from .subplots import (
     create_common_subplot_indicators
 )
 
+from .signals import (
+    BaseSignalLayer,
+    SignalLayerConfig,
+    TradingSignalLayer,
+    BaseTradeLayer,
+    TradeLayerConfig,
+    TradeExecutionLayer,
+    create_trading_signal_layer,
+    create_buy_signals_only_layer,
+    create_sell_signals_only_layer,
+    create_high_confidence_signals_layer,
+    create_trade_execution_layer,
+    create_profitable_trades_only_layer,
+    create_losing_trades_only_layer
+)
+
 __all__ = [
     # Base layers
     'BaseChartLayer',
@@ -68,6 +86,16 @@ __all__ = [
     'RSILayer',
     'MACDLayer',
     
+    # Signal layers
+    'BaseSignalLayer',
+    'SignalLayerConfig',
+    'TradingSignalLayer',
+    
+    # Trade layers
+    'BaseTradeLayer',
+    'TradeLayerConfig',
+    'TradeExecutionLayer',
+    
     # Convenience functions
     'create_sma_layer',
     'create_ema_layer',
@@ -76,7 +104,14 @@ __all__ = [
     'create_common_overlay_indicators',
     'create_rsi_layer',
     'create_macd_layer',
-    'create_common_subplot_indicators'
+    'create_common_subplot_indicators',
+    'create_trading_signal_layer',
+    'create_buy_signals_only_layer',
+    'create_sell_signals_only_layer',
+    'create_high_confidence_signals_layer',
+    'create_trade_execution_layer',
+    'create_profitable_trades_only_layer',
+    'create_losing_trades_only_layer'
 ]
 
 __version__ = "0.1.0"