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✨ Added

• Backup System – Complete backup and restore functionality
  • Automatic daily backups with configurable retention
  • Manual backup creation via /sync backup create
  • Restore backups via /sync restore <player> [backup_id]
  • SQL dump generation for database backups
  • ZIP compression for file backups
  • Backup listing and management commands
• Performance Caching – In-memory player data cache
  • Configurable cache size and TTL (Time-To-Live)
  • LRU eviction policy (Least Recently Used)
  • Optional compression for memory optimization
  • Cache statistics and management via /sync cache
• Enhanced Performance Monitoring
  • Detailed save/load time tracking
  • Connection pool statistics
  • Performance metrics logging
  • Slow operation detection and warnings
• Improved Update Checker
  • Configurable timeout settings
  • Better error handling for network issues
  • Download link in update notifications
  • User-Agent header for API requests
• Emergency Configuration System
  • Automatic config file creation if missing
  • Fallback configuration generation
  • Debug information for configuration issues
  • Multi-layer configuration loading approach

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Changed

• Achievement Sync Limits – Increased support for Minecraft’s 1000+ advancements
  • MAX_COUNT_ATTEMPTS: 1000 → 2000
  • MAX_ACHIEVEMENTS: 1000 → 2000
  • MAX_PROCESSED: 2000 → 3000
  • Large amount warning threshold: 500 → 1500
• Database Performance
  • Enhanced connection pooling
  • Exponential backoff for connection acquisition
  • Increased total timeout to 10 seconds
  • Better connection pool exhaustion handling
• Inventory Utilities
  • Improved ItemStack sanitization and validation
  • Better corrupted data handling
  • Enhanced Base64 serialization and deserialization
• Configuration Management
  • Multiple fallback mechanisms
  • Emergency configuration creation
  • Better error diagnostics and logging

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Fixed

• Critical Achievement Bug – Fixed infinite loop in advancement counting
  • Added hard limits to prevent server freezes
  • Implemented timeout-based processing
  • Better error handling and logging
• Database Parameter Error
  • Fixed "No value specified for parameter 20" issue
  • Corrected SQL REPLACE INTO statement
  • Added missing advancements and server_id parameters
• Slow Save Detection
  • Optimized achievement serialization for large data sets
  • Reduced processing time with batch operations
  • Implemented performance monitoring with timeouts
• Configuration Loading
  • Fixed empty config.yml issue
  • Added fallback configuration mechanisms
  • Improved resource loading handling
• Compilation Errors
  • Added missing imports (java.io.File, java.io.FileWriter)
  • Resolved date ambiguity in BackupManager
  • Fixed nested try-catch block issues

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Security

• Improved ItemStack sanitization and data validation
• Enhanced audit logging for security events
• Better error recovery for corrupted data

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⚡ Performance

• Cache compression and TTL management
• Optimized database efficiency with connection pooling and batching
• Non-blocking asynchronous backup and save operations
• Improved memory and resource cleanup

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Compatibility

• Full support for Minecraft 1.21.5
• Maintained legacy support for 1.20.x
• Compatible with MySQL, SQLite, and PostgreSQL
• Proper API version handling

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⚙️ Configuration

• performance.cache_ttl – Cache time-to-live in milliseconds
• performance.cache_compression – Enable or disable cache compression
• update_checker.timeout – Connection timeout for update checks
• performance.max_achievements_per_player – Increased to 2000
• server.id – Unique server identifier for multi-server setups

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️ Commands

• New Commands
  • /sync backup create – Create a manual backup
  • /sync restore <player> [backup_id] – Restore a player from a backup
  • /sync cache clear – Clear performance cache
• Enhanced Commands
  • /sync cache – Now shows performance and connection pool statistics
  • /sync status – Improved status reporting
  • /sync reload – Better configuration reload handling

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Technical Details

• Improved error handling and logging
• Better memory and resource management
• Enhanced diagnostic information for debugging
• More robust exception handling and recovery

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