- Declare `password` as a proper dataclass field (repr=False) so it is
visible to type checkers and any code path that constructs a bare
ConnectionProfile; drop the now-unused Optional import.
- Fix _conn_str() fallback loop: the return was inside the for-body,
so only ODBC Driver 18 was ever tried. Now uses pyodbc.drivers() to
pick the first installed driver from the preference list.
- Make _cur() a thread-safe @contextmanager that holds self._lock for
the cursor's lifetime, matching MySQL/PostgreSQL/SQLite. Updated all
16 call sites to `with self._cur() as c:`.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nngoandClaude Sonnet 4.6
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