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omop/CHANGELOG.md

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+# Changelog
+
+All notable changes to the OMOP Data Pipeline project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2024-01-XX
+
+### Added
+- Initial release of OMOP CDM 5.4 Data Pipeline
+- Complete OMOP CDM 5.4 schema implementation (30+ tables)
+- Staging schema for raw data ingestion
+- Audit schema for ETL tracking and data quality metrics
+- Extractor component for batch and incremental extraction
+- Concept Mapper with LRU caching and multi-level mapping strategy
+- Transformer for all major OMOP tables (PERSON, VISIT_OCCURRENCE, CONDITION_OCCURRENCE, etc.)
+- Validator with comprehensive data quality checks
+- Loader with bulk insert and UPSERT capabilities
+- Orchestrator for coordinating complete ETL flow
+- Parallel processing with ThreadPoolExecutor
+- Error Handler with retry logic, circuit breaker, and checkpoint/resume
+- CLI interface with comprehensive commands
+- Vocabulary Loader for OMOP vocabularies
+- Configuration management with YAML and environment variables
+- Comprehensive logging with file rotation
+- Database connection pooling with retry logic
+- Pydantic models for all OMOP tables
+- PostgreSQL sequences for ID generation
+
+### Features
+- Automated concept mapping with fallback strategies
+- Batch processing with configurable batch sizes
+- Multi-threaded parallel processing
+- Transaction management with automatic rollback
+- Foreign key validation before loading
+- Date validation and parsing
+- Referential integrity checks
+- OMOP compliance validation
+- Unmapped code tracking
+- Execution statistics and audit trail
+- Progress bars for long-running operations
+- Verbose logging mode
+
+### Documentation
+- README with quick start guide
+- User guide with detailed instructions
+- Architecture documentation
+- Transformation rules documentation
+- API documentation in code
+- Configuration examples
+
+### Requirements
+- Python 3.12+
+- PostgreSQL 16.11+
+- SQLAlchemy 2.0+
+- Pydantic 2.5+
+- Click 8.1+
+- Other dependencies in requirements.txt
+
+## [Unreleased]
+
+### Planned
+- Property-based tests with Hypothesis
+- Integration tests for complete ETL flow
+- Performance benchmarking suite
+- Docker containerization
+- CI/CD pipeline
+- Data Quality Dashboard integration
+- Additional source data formats (HL7, FHIR)
+- Incremental ETL mode
+- Data lineage tracking
+- Web-based monitoring dashboard
+- REST API for programmatic access