# Implementation Plan

- [ ] 1. Fix data structure initialization in MultiExchangeCOBProvider
  - Ensure all collections are properly initialized during object creation
  - Add defensive checks before accessing data structures
  - Implement proper initialization for symbol-specific data structures
  - _Requirements: 1.1, 1.2, 2.1_

- [ ] 1.1. Update MultiExchangeCOBProvider constructor
  - Modify __init__ method to properly initialize all data structures
  - Ensure exchange_order_books is initialized for each symbol and exchange
  - Initialize session_trades and svp_cache for each symbol
  - Add defensive checks to prevent NoneType errors
  - _Requirements: 1.2, 2.1_

- [ ] 1.2. Fix _notify_cob_subscribers method
  - Add validation to ensure cob_snapshot is not None before processing
  - Add defensive checks before accessing cob_snapshot attributes
  - Improve error handling for subscriber callbacks
  - Add detailed logging for debugging
  - _Requirements: 1.1, 1.5, 2.3_

- [ ] 2. Enhance WebSocket data processing in MultiExchangeCOBProvider
  - Improve error handling in WebSocket connection methods
  - Add validation for incoming data
  - Implement reconnection logic with exponential backoff
  - _Requirements: 1.3, 1.4, 3.1, 3.2_

- [ ] 2.1. Update _stream_binance_orderbook method
  - Add data structure initialization checks
  - Implement exponential backoff for reconnection attempts
  - Add detailed error logging
  - Ensure proper cleanup on disconnection
  - _Requirements: 1.4, 3.2, 3.4_

- [ ] 2.2. Fix _process_binance_orderbook method
  - Add validation for incoming data
  - Ensure data structures exist before updating
  - Add defensive checks to prevent NoneType errors
  - Improve error handling and logging
  - _Requirements: 1.1, 1.3, 3.1_

- [ ] 3. Update StandardizedDataProvider to handle COB data properly
  - Improve initialization of COB-related data structures
  - Add validation for COB data
  - Enhance error handling for COB data processing
  - _Requirements: 1.3, 2.2, 2.3_

- [ ] 3.1. Fix _get_cob_data method
  - Add validation for COB provider availability
  - Ensure proper initialization of COB data structures
  - Add defensive checks to prevent NoneType errors
  - Improve error handling and logging
  - _Requirements: 1.3, 2.2, 3.3_

- [ ] 3.2. Update _calculate_cob_moving_averages method
  - Add validation for input data
  - Ensure proper initialization of moving average data structures
  - Add defensive checks to prevent NoneType errors
  - Improve error handling for edge cases
  - _Requirements: 1.3, 2.2, 3.3_

- [ ] 4. Implement recovery mechanisms for WebSocket failures
  - Add state tracking for WebSocket connections
  - Implement automatic reconnection with exponential backoff
  - Add fallback mechanisms for temporary failures
  - _Requirements: 3.2, 3.3, 3.4_

- [ ] 4.1. Add connection state management
  - Track connection state for each WebSocket
  - Implement health check mechanism
  - Add reconnection logic based on connection state
  - _Requirements: 3.2, 3.4_

- [ ] 4.2. Implement data recovery mechanisms
  - Add caching for last valid data
  - Implement fallback to cached data during connection issues
  - Add mechanism to rebuild state after reconnection
  - _Requirements: 3.3, 3.4_

- [ ] 5. Add comprehensive logging for debugging
  - Add detailed logging throughout the COB processing pipeline
  - Include context information in log messages
  - Add performance metrics logging
  - _Requirements: 1.5, 3.1_

- [ ] 5.1. Enhance logging in MultiExchangeCOBProvider
  - Add detailed logging for WebSocket connections
  - Log data processing steps and outcomes
  - Add performance metrics for data processing
  - _Requirements: 1.5, 3.1_

- [ ] 5.2. Add logging in StandardizedDataProvider
  - Log COB data processing steps
  - Add validation logging
  - Include performance metrics for data processing
  - _Requirements: 1.5, 3.1_

- [ ] 6. Test all changes thoroughly
  - Write unit tests for fixed components
  - Test integration between components
  - Verify dashboard operation with COB data
  - _Requirements: 1.1, 2.3, 3.4_

- [ ] 6.1. Write unit tests for MultiExchangeCOBProvider
  - Test data structure initialization
  - Test WebSocket processing with mock data
  - Test error handling and recovery
  - _Requirements: 1.1, 1.3, 3.1_

- [ ] 6.2. Test integration with dashboard
  - Verify COB data display in dashboard
  - Test system stability under load
  - Verify recovery from failures
  - _Requirements: 1.1, 3.3, 3.4_