work on market-data-gateway

docs/data-services/data-catalog/README.md

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+# Data Catalog
+
+## Overview
+The Data Catalog service provides a centralized system for data asset discovery, management, and governance within the stock-bot platform. It serves as the single source of truth for all data assets, their metadata, and relationships, enabling efficient data discovery and utilization across the platform.
+
+## Key Features
+
+### Data Asset Management
+- **Asset Registration**: Automated and manual registration of data assets
+- **Metadata Management**: Comprehensive metadata for all data assets
+- **Versioning**: Tracks changes to data assets over time
+- **Schema Registry**: Central repository of data schemas and formats
+
+### Data Discovery
+- **Search Capabilities**: Advanced search across all data assets
+- **Categorization**: Hierarchical categorization of data assets
+- **Tagging**: Flexible tagging system for improved findability
+- **Popularity Tracking**: Identifies most-used data assets
+
+### Data Governance
+- **Access Control**: Fine-grained access control for data assets
+- **Lineage Tracking**: Visualizes data origins and transformations
+- **Quality Metrics**: Monitors and reports on data quality
+- **Compliance Tracking**: Ensures regulatory compliance for sensitive data
+
+### Integration Framework
+- **API-first Design**: Comprehensive API for programmatic access
+- **Event Notifications**: Real-time notifications for data changes
+- **Bulk Operations**: Efficient handling of batch operations
+- **Extensibility**: Plugin architecture for custom extensions
+
+## Integration Points
+
+### Upstream Connections
+- Data Processor (for processed data assets)
+- Feature Store (for feature metadata)
+- Market Data Gateway (for market data assets)
+
+### Downstream Consumers
+- Strategy Development Environment
+- Data Analysis Tools
+- Machine Learning Pipeline
+- Reporting Systems
+
+## Technical Implementation
+
+### Technology Stack
+- **Runtime**: Node.js with TypeScript
+- **Database**: Document database for flexible metadata storage
+- **Search**: Elasticsearch for advanced search capabilities
+- **API**: GraphQL for flexible querying
+- **UI**: React-based web interface
+
+### Architecture Pattern
+- Domain-driven design for complex metadata management
+- Microservice architecture for scalability
+- Event sourcing for change tracking
+- CQRS for optimized read/write operations
+
+## Development Guidelines
+
+### Metadata Standards
+- Adherence to common metadata standards
+- Required vs. optional metadata fields
+- Validation rules for metadata quality
+- Consistent naming conventions
+
+### Extension Development
+- Plugin architecture documentation
+- Custom metadata field guidelines
+- Integration hook documentation
+- Testing requirements for extensions
+
+### Performance Considerations
+- Indexing strategies for efficient search
+- Caching recommendations
+- Bulk operation best practices
+- Query optimization techniques
+
+## Future Enhancements
+- Automated metadata extraction
+- Machine learning for data classification
+- Advanced lineage visualization
+- Enhanced data quality scoring
+- Collaborative annotations and discussions
+- Integration with external data marketplaces