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+# mem-db-utils - GitHub Copilot Instructions
+
+**Python package for in-memory database utilities supporting Redis, Memcached, Dragonfly, and Valkey.**
+
+Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
+
+## Working Effectively
+
+### Bootstrap, Build, and Test Repository:
+- `pip install -e .` -- installs the package in development mode. NEVER CANCEL: Takes 10-60 seconds, may timeout due to network issues. Set timeout to 120+ seconds (extra margin for slow mirrors or network issues).
+- `pip install coverage pre-commit pytest pytest-cov pytest-dotenv ruff` -- installs development dependencies. NEVER CANCEL: Takes 30-120 seconds. Set timeout to 180+ seconds (extra margin for slow mirrors or network issues).
+- `python -m pytest tests/ -v` -- runs unit tests (takes ~0.4 seconds, 20 passed, 5 skipped without database)
+- `ruff check .` -- runs linting (takes ~0.01 seconds)  
+- `ruff format --check .` -- checks code formatting (takes ~0.01 seconds)
+
+### Environment Configuration:
+- Create `.env` file with `DB_URL=redis://localhost:6379/0` for basic testing
+- Package requires `DB_URL` environment variable to be set at runtime
+- Supported database URLs: `redis://`, `memcached://`, `dragonfly://`, `valkey://`
+- Optional environment variables: `DB_TYPE`, `REDIS_CONNECTION_TYPE`, `REDIS_MASTER_SERVICE`, `DB_TIMEOUT`
+
+### Run Integration Tests with Real Database:
+- Start Redis: `docker run -d --name test-redis -p 6379:6379 redis:7-alpine` (NEVER CANCEL: Takes 30-60 seconds for first download)
+- Wait for startup: `sleep 5`
+- Run integration tests: `DB_URL=redis://localhost:6379/0 python -m pytest tests/test_integration.py -v` (takes ~0.4 seconds, 1 may fail on error handling test)
+- Clean up: `docker stop test-redis && docker rm test-redis`
+
+## Validation Scenarios
+
+### Always Test After Making Changes:
+1. **Import Test**: `DB_URL=redis://localhost:6379/0 python -c "from mem_db_utils import MemDBConnector; print('Import successful')"`
+2. **Basic Functionality Test** (requires Redis running):
+   ```bash
+   DB_URL=redis://localhost:6379/0 python -c "
+   from mem_db_utils import MemDBConnector
+   conn = MemDBConnector().connect(db=0)
+   conn.ping()
+   conn.set('test', 'value')
+   assert conn.get('test') == 'value'
+   conn.delete('test')
+   print('Validation PASSED')
+   "
+   ```
+3. **Run Full Test Suite**: `python -m pytest tests/ -v --cov=src --cov-report=term-missing`
+4. **Linting**: `ruff check . && ruff format --check .`
+
+### Manual Testing Requirements:
+- ALWAYS test basic database connection and operations after code changes
+- Test with different database types by changing DB_URL protocol
+- Verify configuration loading works with various environment variable combinations
+- Test error handling with invalid database URLs or unreachable servers
+
+## Common Tasks
+
+### Repository Structure:
+```
+mem-db-utils/
+├── .github/workflows/     # CI/CD pipelines
+├── src/mem_db_utils/     # Main package source
+│   ├── __init__.py       # MemDBConnector class
+│   ├── config.py         # Environment configuration
+│   └── py.typed          # Type hints marker
+├── tests/                # Test files
+├── pyproject.toml        # Project configuration
+└── README.md            # Documentation
+```
+
+### Key Files to Check After Changes:
+- Always verify `src/mem_db_utils/__init__.py` after changing MemDBConnector logic
+- Check `src/mem_db_utils/config.py` after modifying configuration handling
+- Update tests in `tests/` when adding new functionality
+- Run integration tests in `tests/test_integration.py` with real database
+
+### Development Dependencies:
+- **Testing**: pytest, pytest-cov, pytest-dotenv, coverage
+- **Linting**: ruff (replaces black, flake8, isort)
+- **Git hooks**: pre-commit
+- **Type checking**: Built into package with py.typed marker
+
+### Build and Package:
+- `python -m build` -- builds distribution packages. NEVER CANCEL: May fail due to network timeouts depending on the configured build backend and network environment (see `pyproject.toml` for the backend in use). Consider this command unreliable in constrained network environments.
+- Package metadata in `pyproject.toml`
+- Uses standard Python packaging; the build backend is specified in `pyproject.toml` (may require network access to a custom PyPI index depending on backend).
+- **Note**: Package installation works fine, but building from source may be problematic due to external dependencies
+
+## Database Types and Testing
+
+### Supported Database Types:
+- **Redis**: `redis://localhost:6379/0` (most common, full functionality)
+- **Memcached**: `memcached://localhost:11211` (basic key-value operations)
+- **Dragonfly**: `dragonfly://localhost:6380` (Redis-compatible)
+- **Valkey**: `valkey://localhost:6381` (Redis-compatible)
+
+### Database-Specific Testing:
+- **Redis/Dragonfly/Valkey**: Support database selection (`db` parameter), ping, set/get/delete
+- **Memcached**: Basic connection only, no database selection
+- **Redis Sentinel**: Requires `REDIS_CONNECTION_TYPE=sentinel` and `REDIS_MASTER_SERVICE` environment variables
+
+### Setting up Test Databases with Docker:
+- Redis: `docker run -d --name test-redis -p 6379:6379 redis:7-alpine`
+- Memcached: `docker run -d --name test-memcached -p 11211:11211 memcached:1.6-alpine`
+- Dragonfly: `docker run -d --name test-dragonfly -p 6380:6380 docker.dragonflydb.io/dragonflydb/dragonfly`
+
+## CI/CD Pipeline (.github/workflows)
+
+### Linter Pipeline (linter.yaml):
+- Runs on pull requests
+- Uses `chartboost/ruff-action@v1` for linting and format checking
+- ALWAYS run `ruff check .` and `ruff format --check .` before committing
+
+### Package Publishing (publish_package.yaml):
+- Triggers on git tags
+- Builds with `python -m build`
+- Publishes to PyPI
+- Creates GitHub releases with sigstore signatures
+
+## Critical Notes
+
+### Environment Variable Loading:
+- Package uses `pydantic-settings` with `python-dotenv` integration
+- Environment variables are loaded from `.env` files automatically
+- Configuration is validated at import time, not lazily
+- Missing `DB_URL` will cause import failure with ValidationError
+
+### Error Handling:
+- Import failures occur when `DB_URL` is missing or invalid protocol
+- Connection failures in integration tests are skipped (pytest.skip)
+- Invalid database numbers may or may not raise exceptions depending on database type
+
+### Memory and Performance:
+- MemDBConnector uses `__slots__` for memory efficiency
+- Connection objects are created per call to `connect()`
+- No connection pooling implemented in base connector
+- Timeouts configurable via `DB_TIMEOUT` environment variable (default: 30 seconds)
+
+## Troubleshooting
+
+### Common Issues:
+1. **Import Error**: Ensure `DB_URL` environment variable is set
+2. **Test Failures**: Start appropriate database container first
+3. **Linting Failures**: Run `ruff format .` to auto-fix formatting issues
+4. **Missing Dependencies**: Run `pip install -e .` to reinstall package
+5. **Network Timeouts**: Package uses custom PyPI index (pypi.prismatica.in) which may be unreachable. pip install and python -m build commands may timeout.
+
+### Network Dependencies:
+- Package depends on custom PyPI index at pypi.prismatica.in
+- Build commands may fail with network timeouts in restricted environments
+- Runtime functionality works fine once dependencies are installed
+- Consider using pre-installed environments or alternative package sources if network issues persist
+
+### Database Connection Issues:
+- Check if database container is running: `docker ps`
+- Test connection manually: `docker exec -it test-redis redis-cli ping`
+- Verify port availability: `netstat -tlnp | grep 6379`
+- Check firewall settings if running on remote host