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Wraps any unconnected backend instance and defers do_connect() until the first attribute access. Uses double-checked locking for thread safety and a __class__ property override so isinstance() checks against the wrapped backend's type continue to pass. Includes 12 tests covering connection lifecycle, thread safety, isinstance compatibility, attribute delegation, and a full DuckDB file-based roundtrip. Also integrates LazyBackend into the expression loading pipeline: - Profile.get_lazy_con() returns a LazyBackend wrapping an unconnected backend, deferring do_connect until first use Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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