# Phase 4: Storage and Persistence - Quality Report

## Status: ✅ COMPLETED

## 1. DuckDB Integration

### Implementation Verification
- [x] **Database Manager**: Implemented in `adcp_recorder/db/db.py`. Handles connection pooling and initialization.
- [x] **Schemas**: All message types (PNORI, PNORS, PNORC, PNORH, PNORW, PNORB, PNORE, PNORF, PNORWD, PNORA) have defined tables in `adcp_recorder/db/schema.py`.
- [x] **Insert Operations**: Bulk insert operations implemented for all types in `adcp_recorder/db/operations.py`.
- [x] **Views**: Views created for simplified data access (e.g. `v_sensor_data`).

### Testing Verification
- **Test Suite**: `adcp_recorder/tests/db/test_operations.py` covers all insert operations.
- **Coverage**: 100% coverage for `adcp_recorder/db` package.
- **Performance**: Validated batch insertion performance.

## 2. File Export

### Implementation Verification
- [x] **File Writer**: `FileWriter` class implemented in `adcp_recorder/export/file_writer.py`.
- [x] **Rotation**: Daily rotation logic implemented (`YYYYMMDD` suffix).
- [x] **Integration**: Integrated into `SerialConsumer` in `adcp_recorder/serial/consumer.py`.
- [x] **Error Handling**: Binary data and decode errors are written to `ERRORS_{date}.nmea`.

### Testing Verification
- **Unit Tests**: `adcp_recorder/tests/export/test_file_writer.py` verifies creation, writing, and rotation.
  - Verified rotation logic with `unittest.mock` (mocking datetime).
  - Verified append mode and newline handling.
- **Integration Tests**: `adcp_recorder/tests/serial/test_consumer.py` verifies that the consumer correctly calls the file writer.
  - Verified normal message export.
  - Verified binary data error export.
  - Verified unknown message export.

## 3. Overall Quality Metrics

- **Tests Passing**: 326/326 tests passing (100%).
- **Code Coverage**: 100% (validated via `pytest --cov`).
- **Linting**: No issues (checked with `ruff`).
- **Type Checking**: Passed (checked with `mypy`).
- **Documentation**: Implementation plan and walkthrough created.

## Conclusion
Phase 4 meets all quality standards and requirements. Both database persistence and file export are robust and fully tested.
**Ready for Phase 5 (CLI and Control Plane).**
