- **Major Rust Code Refactoring (Modularisation)**

- Split monolithic `lib.rs` (2,302 lines) into 14 focused, single-responsibility modules

- **Module structure by feature area**:

- `connection.rs` - Connection lifecycle, establishment, and state management

- `query.rs` - Basic query execution and result handling

- `batch.rs` - Batch operations (transactional and non-transactional)

- `statement.rs` - Prepared statement caching and execution

- `transaction.rs` - Transaction management with ownership tracking

- `savepoint.rs` - Nested transactions (savepoint operations)

- `cursor.rs` - Cursor streaming and result pagination

- `replication.rs` - Remote replica sync control and frame tracking

- `metadata.rs` - Metadata access (rowid, changes, autocommit status)

- `utils.rs` - Shared utilities (safe locking, error handling, row collection)

- `constants.rs` - Global registries and configuration constants

- `models.rs` - Core data structures (LibSQLConn, connection state)

- `decode.rs` - Value decoding and type conversions

- **Test reorganisation** - Refactored monolithic `tests.rs` (1,194 lines) into structured modules:

- `tests/mod.rs` - Test module declaration and organisation

- `tests/constants_tests.rs` - Registry and constant tests

- `tests/utils_tests.rs` - Utility function and safety tests

- `tests/integration_tests.rs` - End-to-end integration tests

- **Root module simplification** - `lib.rs` now only declares modules and exports key types

- **Improved maintainability** - Separation of concerns

- **Zero behaviour changes** - Refactoring is purely organisational, all APIs and functionality preserved

- **Enhanced documentation** - Module-level doc comments explain purpose and relationships

- **Impact**: Significantly improved code navigation, maintenance, and onboarding for contributors

- **Constraint Error Message Handling**

- Enhanced constraint name extraction to support index names in error messages

- Now correctly extracts custom index names from enhanced error format: `(index: index_name)`

- Falls back to column name extraction for standard SQLite error messages

- Improves `unique_constraint/3` matching with custom index names in changesets

- Clarified documentation on composite unique constraint handling

- Better support for complex constraint scenarios with multiple columns

- **Remote Turso Tests**

- Reduced test database size by removing unnecessary operations

- Improved test stability and execution reliability