a801046669
Follow-ups for salvaged PR #43819: the registry key was str(Path(db_path).expanduser()) — a symlinked or relative path to the same DB file got its own connection, silently reintroducing the exact multi-writer contention the registry prevents. Key on Path.resolve() (OSError-tolerant fallback). Adds a symlink regression test and the AUTHOR_MAP entry for adambiggs.