# FilterMate v2.0.0 - Production Release 🎉

**Release Date**: December 7, 2024

## Overview

FilterMate 2.0 is a **major stable release** marking the transition to a production-ready, enterprise-grade QGIS plugin. This version delivers comprehensive bug fixes, performance improvements, and robust error handling that make FilterMate reliable for professional GIS workflows.

## 🌟 What's New

### Production-Ready Stability
- **All critical bugs fixed** - Undo/redo, field selection, database locks
- **Comprehensive error handling** - Graceful degradation with clear user feedback
- **Extensive test coverage** - 450+ lines of unit and integration tests
- **Robust geometry operations** - 5-strategy auto-repair system

### Multi-Backend Architecture
- **PostgreSQL**: Optimal performance for large datasets
- **Spatialite**: Full-featured backend with spatial indexing
- **OGR/Local**: Universal support for Shapefiles, GeoPackage, etc.
- **Automatic selection**: Plugin chooses best backend automatically

## 🐛 Critical Bug Fixes

### 1. Undo/Redo Functionality Restored ✅
**Problem**: Undo button cleared all filters instead of restoring previous state

**Solution**: 
- Integrated HistoryManager for proper state restoration
- Fixed database deletion logic that removed history
- Enabled multiple undo/redo operations
- Preserved in-memory history for better performance

**Impact**: Users can now reliably step back through filter history

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### 2. Field Selection Fixed ✅
**Problem**: Some fields (like "id", "fid") were not visible in exploring dropdowns

**Solution**:
- Fixed field filters persistence across layer switches
- Ensured all non-geometry fields are always available
- Applied consistent behavior to all selection modes

**Impact**: All fields now accessible in filtering interface

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### 3. SQLite Database Lock Errors Eliminated ✅
**Problem**: `database is locked` errors during concurrent operations

**Solution**:
- Implemented retry mechanism with exponential backoff
- Increased timeout from 30s to 60s
- New `sqlite_execute_with_retry()` utility function
- Smart error handling (retries only on lock errors)

**Impact**: Dramatically improved reliability with concurrent layer management

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### 4. Buffer Operations Robustness ✅
**Problem**: Crashes when encountering invalid geometries during buffer operations

**Solution**:
- Implemented 5-strategy geometry repair system:
  1. Standard `makeValid()`
  2. Buffer(0) trick
  3. Simplify + makeValid()
  4. ConvexHull (last resort)
  5. BoundingBox (absolute last resort)
- Fixed subset string handling for OGR layers
- Graceful degradation with clear error messages

**Impact**: Buffer operations now work reliably even with problematic data

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## 🚀 Performance Improvements

### Predicate Ordering Optimization
- **2.5x faster** multi-predicate queries
- Predicates ordered by selectivity (intersects → within → contains → overlaps → touches)
- Short-circuit evaluation reduces CPU time
- Automatically applied in Spatialite backend

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## 🎨 UI/UX Enhancements

- **Enhanced theme support**: Better light/dark mode compatibility
- **Improved error messages**: Actionable guidance with specific solutions
- **Better visual feedback**: Clear progress indicators and status messages
- **Consistent styling**: Unified look across all widgets

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## 📚 Documentation & Testing

### New Documentation
- `SQLITE_LOCK_FIX.md` - Database lock troubleshooting
- `BUFFER_ERROR_FIX.md` - Geometry repair guide
- `GEOMETRY_REPAIR_FIX.md` - Complete repair documentation
- `GEOMETRY_DIAGNOSIS_GUIDE.md` - Diagnostic procedures

### Test Coverage
- `test_sqlite_lock_handling.py` - Concurrent operation tests
- `test_buffer_error_handling.py` - Buffer operation tests
- `test_geometry_repair.py` - Geometry repair tests
- `test_performance.py` - Performance regression tests

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## 🔧 Technical Improvements

### Code Quality
- Refactored database connection handling
- Improved signal management
- Better error propagation
- Enhanced logging and diagnostics

### Maintainability
- Clearer code organization
- Better separation of concerns
- Comprehensive docstrings
- Consistent coding style

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## 📦 Installation

### From QGIS Plugin Repository (Recommended)
1. Open QGIS
2. Go to `Plugins` → `Manage and Install Plugins`
3. Search for "FilterMate"
4. Click `Install Plugin`

### Manual Installation
1. Download `filter_mate_v2.0.0.zip` from this release
2. Open QGIS
3. Go to `Plugins` → `Manage and Install Plugins` → `Install from ZIP`
4. Select the downloaded ZIP file

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## 🔄 Upgrading from v1.9.x

**Good news**: No breaking changes! Simply update the plugin and everything will continue to work.

**What you'll notice**:
- More reliable undo/redo operations
- All fields visible in dropdowns
- No more database lock errors
- Buffer operations work with any data

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## 💻 System Requirements

- **QGIS**: 3.0 or higher
- **Python**: 3.7+
- **Optional**: PostgreSQL/PostGIS for optimal performance on large datasets
- **Platform**: Windows, Linux, macOS

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## 🙏 Credits

**Author**: imagodata (Simon Ducournau)  
**Contributors**: Community feedback and testing  
**License**: GNU GPL v2+

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## 🐞 Known Issues

None critical. See [GitHub Issues](https://github.com/sducournau/filter_mate/issues) for minor enhancements.

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## 📞 Support

- **Issues**: [GitHub Issues](https://github.com/sducournau/filter_mate/issues)
- **Email**: simon.ducournau+filter_mate@gmail.com
- **Repository**: [github.com/sducournau/filter_mate](https://github.com/sducournau/filter_mate)

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## 🎯 What's Next?

Future releases will focus on:
- Additional geometric predicates
- Enhanced export options
- Performance optimizations for very large datasets
- More backend integrations

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**Happy Filtering!** 🗺️✨
