Replace os.remove() in conftest autouse fixture with per-table DELETE
to avoid Windows SQLite file-lock PermissionError being swallowed
silently and leaking state across tests. Remove the inline DELETE
workaround from test_profile_api.py that was coupling the test to
internal DB knowledge.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace deprecated mktemp with mkstemp to eliminate TOCTOU race, narrow
OSError catches to PermissionError (Windows SQLite lock intent only), and
add a deferred-import comment for clarity.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
