### Fixed
- Fixed `upsert` validation for numeric unique keys
- Optimized database lifecycle resilience during space switching and closure.

### Added
- Added `batchUpdate` bulk update interface.
- Added `db.kv` namespace for advanced Key-Value operations (e.g., `db.kv.get()`, `db.kv.clear()`, `db.kv.count()`, `db.kv.setMany()`).

### Changed
- Standardized the database shutdown and cleanup pipeline for improved stability.
- Improved documentation navigation compatibility
- Optimized memory cleanup
- Optimized `count()` performance
- Enhanced system table protection to prevent accidental manual deletion/clearing of critical internal tables.
- Optimized query channel performance, significantly improving the performance of data operations including queries, bulk inserts, and bulk updates.
- Optimized resource-aware scheduling for improved resource management.
- Optimized dense computation and parallel thread scheduling for better isolate dispatch efficiency and high-volume batch processing performance.
- Optimized very large update and delete operations.