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.transform() preserves check constraints, refs #762

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Simon Willison 2026-08-11 21:59:57 -07:00
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@ -1986,6 +1986,15 @@ A bare column name drops any foreign key that column participates in, including
Renaming a column with ``rename=`` updates any foreign keys that use it, and dropping a column with ``drop=`` also drops any foreign keys it participates in - for a compound foreign key this removes the whole constraint.
.. _python_api_transform_check_constraints:
CHECK constraints
-----------------
``.transform()`` preserves both column-level and table-level ``CHECK`` constraints. If a column is renamed, references to that column in the check expression are renamed too.
A column-level check is removed if its owning column is dropped. Dropping a column referenced by any remaining check raises ``TransformError`` instead of creating an invalid or unexpectedly weakened schema.
.. _python_api_transform_views:
Tables referenced by views