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Slow schema generation due to sequential table‑column info fetching

Slow schema generation due to sequential table‑column info fetching: a task in LegoFlow-SWE (Harbor dataset). Current behaviour: The Tables function queries column info sequentially for every table. For large schemas this sequential approach causes generation to exceed one minute.

The task

**Current behaviour:** The `Tables` function queries column info sequentially for every table. For large schemas this sequential approach causes generation to exceed one minute.

Part of Lego-X/LegoFlow-SWE.