fix: resolve Capacitor SQLite database connection issues
- Add comprehensive connection cleanup and retry logic - Implement exponential backoff for database initialization - Add app lifecycle management for proper resource cleanup - Create diagnostic tools for troubleshooting database issues - Fix CameraDirection enum usage for Capacitor Camera v6 - Temporarily disable encryption to isolate connection problems - Add performance monitoring and health check capabilities - Document fixes and troubleshooting procedures Resolves: CapacitorSQLitePlugin null errors Resolves: "Connection timesafari.sqlite already exists" conflicts Resolves: Performance issues causing frame drops Resolves: Memory management and garbage collection errors Author: Matthew Raymer
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Matthew Raymer
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docs/DATABASE_CONNECTION_FIXES.md
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# Database Connection Fixes for TimeSafari
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## Overview
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This document outlines the fixes implemented to resolve database connection issues in the TimeSafari application, particularly for Capacitor SQLite on Android devices.
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## Issues Identified
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### 1. CapacitorSQLitePlugin Errors
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- Multiple `*** ERROR CapacitorSQLitePlugin: null` messages in Android logs
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- Database connection conflicts and initialization failures
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- Connection leaks causing "Connection timesafari.sqlite already exists" errors
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### 2. Performance Issues
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- App skipping 57 frames due to main thread blocking
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- Null pointer exceptions in garbage collection
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- Memory management issues
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### 3. Connection Management
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- Lack of proper connection cleanup on app lifecycle events
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- No retry logic for failed connections
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- Missing error handling and recovery mechanisms
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## Implemented Fixes
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### 1. Enhanced Database Initialization
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#### Connection Cleanup
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- Added `cleanupExistingConnections()` method to properly close existing connections
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- Implemented connection consistency checks before creating new connections
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- Added proper error handling for connection cleanup failures
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#### Retry Logic
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- Implemented exponential backoff retry mechanism for database connections
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- Maximum of 3 retry attempts with increasing delays
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- Comprehensive error logging for each attempt
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#### Database Configuration
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- Configured optimal SQLite settings for performance and stability:
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- `PRAGMA journal_mode=WAL` for better concurrency
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- `PRAGMA synchronous=NORMAL` for balanced performance
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- `PRAGMA cache_size=10000` for improved caching
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- `PRAGMA temp_store=MEMORY` for faster temporary operations
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- `PRAGMA mmap_size=268435456` (256MB) for memory mapping
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### 2. Lifecycle Management
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#### App Lifecycle Listeners
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- Added event listeners for `beforeunload` and `visibilitychange`
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- Automatic database cleanup when app goes to background
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- Proper resource management to prevent connection leaks
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#### Health Monitoring
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- Implemented `healthCheck()` method for connection status monitoring
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- Added `reinitializeDatabase()` for forced reconnection
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- Performance metrics tracking for database operations
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### 3. Error Handling and Diagnostics
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#### Comprehensive Error Handling
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- Enhanced error logging with detailed context
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- Graceful degradation when database operations fail
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- User-friendly error messages with recovery suggestions
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#### Diagnostic Tools
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- Created `databaseDiagnostics.ts` utility for troubleshooting
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- Database stress testing capabilities
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- Performance monitoring and reporting
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- System information collection for debugging
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### 4. Configuration Changes
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#### Capacitor Configuration
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- Temporarily disabled encryption to isolate connection issues
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- Disabled biometric authentication to reduce complexity
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- Maintained proper database location settings
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#### Camera Integration Fixes
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- Fixed `CameraDirection` enum usage for Capacitor Camera v6
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- Updated from string literals to proper enum values
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- Resolved TypeScript compilation errors
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## Usage
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### Running Diagnostics
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```typescript
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import { runDatabaseDiagnostics, stressTestDatabase } from '@/utils/databaseDiagnostics';
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// Run comprehensive diagnostics
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const diagnosticInfo = await runDatabaseDiagnostics();
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console.log('Database status:', diagnosticInfo.connectionStatus);
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// Run stress test
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await stressTestDatabase(20);
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```
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### Health Checks
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```typescript
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import { PlatformServiceFactory } from '@/services/PlatformServiceFactory';
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const platformService = PlatformServiceFactory.getInstance();
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const health = await platformService.healthCheck();
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if (!health.healthy) {
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console.error('Database health check failed:', health.error);
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// Attempt reinitialization
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await platformService.reinitializeDatabase();
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}
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```
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### Performance Monitoring
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```typescript
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import { logDatabasePerformance } from '@/utils/databaseDiagnostics';
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// Wrap database operations with performance monitoring
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const start = Date.now();
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await platformService.dbQuery("SELECT * FROM users");
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const duration = Date.now() - start;
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logDatabasePerformance("User query", duration);
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```
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## Troubleshooting Guide
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### Common Issues and Solutions
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#### 1. "Connection timesafari.sqlite already exists"
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**Cause**: Multiple database connections not properly closed
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**Solution**:
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- Use the enhanced cleanup methods
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- Check for existing connections before creating new ones
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- Implement proper app lifecycle management
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#### 2. CapacitorSQLitePlugin null errors
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**Cause**: Database initialization failures or connection conflicts
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**Solution**:
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- Use retry logic with exponential backoff
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- Check connection consistency
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- Verify database configuration settings
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#### 3. Performance Issues
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**Cause**: Main thread blocking or inefficient database operations
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**Solution**:
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- Use WAL journal mode for better concurrency
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- Implement proper connection pooling
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- Monitor and optimize query performance
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#### 4. Memory Leaks
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**Cause**: Database connections not properly closed
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**Solution**:
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- Implement proper cleanup on app lifecycle events
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- Use health checks to monitor connection status
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- Force reinitialization when issues are detected
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### Debugging Steps
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1. **Check Logs**: Look for database-related error messages
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2. **Run Diagnostics**: Use `runDatabaseDiagnostics()` to get system status
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3. **Monitor Performance**: Track query execution times
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4. **Test Connections**: Use stress testing to identify issues
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5. **Verify Configuration**: Check Capacitor and SQLite settings
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### Recovery Procedures
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#### Automatic Recovery
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- Health checks run periodically
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- Automatic reinitialization on connection failures
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- Graceful degradation for non-critical operations
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#### Manual Recovery
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- Force app restart to clear all connections
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- Clear app data if persistent issues occur
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- Check device storage and permissions
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## Security Considerations
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### Data Protection
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- Encryption can be re-enabled once connection issues are resolved
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- Biometric authentication can be restored after stability is confirmed
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- Proper error handling prevents data corruption
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### Privacy
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- Diagnostic information is logged locally only
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- No sensitive data is exposed in error messages
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- User data remains protected during recovery procedures
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## Performance Impact
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### Improvements
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- Reduced connection initialization time
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- Better memory usage through proper cleanup
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- Improved app responsiveness with background processing
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- Enhanced error recovery reduces user impact
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### Monitoring
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- Performance metrics are tracked automatically
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- Slow operations are logged with warnings
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- System resource usage is monitored
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## Future Enhancements
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### Planned Improvements
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1. **Connection Pooling**: Implement proper connection pooling for better performance
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2. **Encryption Re-enablement**: Restore encryption once stability is confirmed
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3. **Advanced Monitoring**: Add real-time performance dashboards
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4. **Automated Recovery**: Implement self-healing mechanisms
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### Research Areas
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1. **Alternative Storage**: Investigate other storage solutions for specific use cases
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2. **Migration Tools**: Develop tools for seamless data migration
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3. **Cross-Platform Optimization**: Optimize for different device capabilities
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## Conclusion
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These fixes address the core database connection issues while maintaining application stability and user experience. The enhanced error handling, monitoring, and recovery mechanisms provide a robust foundation for reliable database operations across all platforms.
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## Author
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Matthew Raymer - Database Architecture and Mobile Platform Development
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