Added os.chmod(db_path, 0o664) after database creation to ensure the template
database has writable permissions. This prevents sqlite3.OperationalError: attempt
to write a readonly database when tests copy and modify the template during test
setup.
The template database is now created with rw-rw-r-- (664) permissions instead of
the default rw-r--r-- (644), allowing the test runner process to write to it.
ISSUES CLOSED: #9372
HAL9000