bucket aggregation

.kiro/specs/multi-exchange-data-aggregation/tasks.md

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   - _Requirements: 3.1, 3.2, 3.3, 3.4_
 
 
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 - [ ] 3. Create base exchange connector framework
   - Implement abstract base class for exchange WebSocket connectors
   - Create connection management with exponential backoff and circuit breaker patterns
   - Implement WebSocket message handling with proper error recovery
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   - Add connection status monitoring and health checks
   - _Requirements: 1.1, 1.3, 1.4, 8.5_