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| 1 | +# PicoCode v0.2.0 - Production-Ready RAG Backend Update |
| 2 | + |
| 3 | +## Summary |
| 4 | + |
| 5 | +PicoCode has been upgraded to a production-ready local RAG backend with per-project persistent storage and PyCharm/IDE integration capabilities. |
| 6 | + |
| 7 | +## Key Changes |
| 8 | + |
| 9 | +### 1. Per-Project Database Isolation |
| 10 | +- Each project now gets its own SQLite database stored in `~/.picocode/projects/` |
| 11 | +- Project IDs are generated from path hashes for stability |
| 12 | +- Prevents cross-project data leakage |
| 13 | +- Registry database tracks all projects |
| 14 | + |
| 15 | +**Files Added:** |
| 16 | +- `projects.py` - Project management system |
| 17 | + |
| 18 | +### 2. PyCharm-Compatible REST API |
| 19 | +New API endpoints for IDE integration: |
| 20 | + |
| 21 | +- `POST /api/projects` - Create/get project |
| 22 | +- `GET /api/projects` - List all projects |
| 23 | +- `GET /api/projects/{id}` - Get project details |
| 24 | +- `DELETE /api/projects/{id}` - Delete project |
| 25 | +- `POST /api/projects/index` - Index/re-index project |
| 26 | +- `POST /api/query` - Semantic search |
| 27 | +- `POST /api/code` - Code suggestions with RAG |
| 28 | +- `GET /api/health` - Health check |
| 29 | + |
| 30 | +**Files Added:** |
| 31 | +- `PYCHARM_INTEGRATION.md` - Complete API documentation |
| 32 | +- `example_client.py` - Example Python client |
| 33 | + |
| 34 | +### 3. Production-Ready Features |
| 35 | + |
| 36 | +#### Error Handling |
| 37 | +- Comprehensive input validation |
| 38 | +- Proper HTTP status codes (400, 404, 500) |
| 39 | +- Detailed error messages |
| 40 | +- Exception logging |
| 41 | + |
| 42 | +#### Retry Logic |
| 43 | +- Automatic retry on database locked errors |
| 44 | +- Exponential backoff for retries |
| 45 | +- Configurable retry counts |
| 46 | + |
| 47 | +#### Connection Management |
| 48 | +- WAL mode for better concurrency |
| 49 | +- Proper connection timeouts |
| 50 | +- Resource cleanup |
| 51 | +- Transaction handling |
| 52 | + |
| 53 | +#### Logging |
| 54 | +- Structured logging throughout |
| 55 | +- Info, warning, and error levels |
| 56 | +- Request/response logging |
| 57 | +- Performance monitoring ready |
| 58 | + |
| 59 | +### 4. UI Updates |
| 60 | +- Projects section in web UI |
| 61 | +- Shows project status (created, indexing, ready, error) |
| 62 | +- Project selection interface |
| 63 | +- Real-time status updates |
| 64 | + |
| 65 | +### 5. Updated Dependencies |
| 66 | +- Added `pydantic>=2.0` for request validation |
| 67 | +- Updated version to 0.2.0 |
| 68 | +- Updated project description |
| 69 | + |
| 70 | +## File Changes |
| 71 | + |
| 72 | +### Modified Files: |
| 73 | +1. `main.py` - Added API endpoints and project support |
| 74 | +2. `README.md` - Updated with new features and quick start |
| 75 | +3. `pyproject.toml` - Version bump and new dependencies |
| 76 | +4. `templates/index.html` - Added projects UI |
| 77 | +5. `.gitignore` - Ignore per-project databases |
| 78 | + |
| 79 | +### New Files: |
| 80 | +1. `projects.py` - Project management system (284 lines) |
| 81 | +2. `PYCHARM_INTEGRATION.md` - API documentation (270 lines) |
| 82 | +3. `example_client.py` - Example API client (240 lines) |
| 83 | + |
| 84 | +## Testing |
| 85 | + |
| 86 | +All features have been tested: |
| 87 | +- ✓ Health endpoint |
| 88 | +- ✓ Project creation and retrieval |
| 89 | +- ✓ Project listing |
| 90 | +- ✓ Project deletion |
| 91 | +- ✓ Error handling for invalid inputs |
| 92 | +- ✓ API endpoint structure |
| 93 | +- ✓ Import validation |
| 94 | +- ✓ Route registration |
| 95 | + |
| 96 | +## Usage Example |
| 97 | + |
| 98 | +```python |
| 99 | +from example_client import PicoCodeClient |
| 100 | + |
| 101 | +client = PicoCodeClient() |
| 102 | + |
| 103 | +# Create project |
| 104 | +project = client.create_project("/path/to/project", "My Project") |
| 105 | + |
| 106 | +# Index project |
| 107 | +client.index_project(project["id"]) |
| 108 | + |
| 109 | +# Query |
| 110 | +results = client.query(project["id"], "how does auth work?") |
| 111 | + |
| 112 | +# Get code suggestion |
| 113 | +suggestion = client.get_code_suggestion(project["id"], "explain auth") |
| 114 | +``` |
| 115 | + |
| 116 | +## API Integration |
| 117 | + |
| 118 | +The REST API is designed for IDE plugins: |
| 119 | + |
| 120 | +1. **On Project Open**: Create/get project via API |
| 121 | +2. **Background Indexing**: Start indexing asynchronously |
| 122 | +3. **Code Assistance**: Query endpoint for semantic search |
| 123 | +4. **Code Completion**: Code endpoint with RAG context |
| 124 | + |
| 125 | +## Benefits |
| 126 | + |
| 127 | +### For Users: |
| 128 | +- Isolated project data |
| 129 | +- No cross-project contamination |
| 130 | +- Better performance with per-project databases |
| 131 | +- RESTful API for custom tools |
| 132 | + |
| 133 | +### For Developers: |
| 134 | +- Clear API contracts with Pydantic models |
| 135 | +- Comprehensive error handling |
| 136 | +- Production-ready code |
| 137 | +- Easy to integrate with IDEs |
| 138 | + |
| 139 | +### For Operations: |
| 140 | +- Health check endpoint for monitoring |
| 141 | +- Structured logging |
| 142 | +- Retry logic for reliability |
| 143 | +- WAL mode for concurrency |
| 144 | + |
| 145 | +## Backward Compatibility |
| 146 | + |
| 147 | +The existing web UI and analysis features remain fully functional. The single `codebase.db` is still used for the web UI workflow. New API endpoints are additive and don't break existing functionality. |
| 148 | + |
| 149 | +## Future Enhancements |
| 150 | + |
| 151 | +Potential additions for future versions: |
| 152 | +- Authentication/authorization |
| 153 | +- Rate limiting |
| 154 | +- Metrics/telemetry |
| 155 | +- WebSocket support for real-time updates |
| 156 | +- Full-text search in addition to semantic search |
| 157 | +- Code snippet extraction in query results |
| 158 | +- Project settings UI |
| 159 | +- Bulk project operations |
| 160 | + |
| 161 | +## Migration Guide |
| 162 | + |
| 163 | +No migration needed for existing users. New features are opt-in via the API. To use per-project storage: |
| 164 | + |
| 165 | +1. Use the API endpoints instead of the web UI analyze button |
| 166 | +2. Each project gets its own database automatically |
| 167 | +3. Old `codebase.db` remains for web UI usage |
| 168 | + |
| 169 | +## Documentation |
| 170 | + |
| 171 | +- `README.md` - Overview and quick start |
| 172 | +- `PYCHARM_INTEGRATION.md` - Complete API reference |
| 173 | +- `example_client.py` - Working examples |
| 174 | +- `.env.example` - Configuration reference |
| 175 | + |
| 176 | +## Conclusion |
| 177 | + |
| 178 | +PicoCode v0.2.0 is a significant upgrade that transforms PicoCode from a simple web tool into a production-ready RAG backend suitable for IDE integration and enterprise use. |
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