v0.9.4.1

Fix MySQL trigger errors with empty timestamp values

- Remove CAST operations that fail on empty strings in strict SQL mode
- Change VARCHAR(4000) to TEXT for long concatenated strings
- Add NULL handling for ClientInfrastructure.Assets initialization
- Fix migration script for MySQL compatibility (result[0] instead of result.rows)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>