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table.transform(rename=...) now preserves indexes, closes #822

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Simon Willison 2026-08-12 14:42:24 -07:00
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@ -12,6 +12,7 @@ Unreleased
- New ``table.checks``, ``table.column_checks`` and ``table.table_checks`` introspection properties expose column-level and table-level ``CHECK`` constraints. (:issue:`834`)
- ``table.transform()`` now preserves ``CHECK`` constraints, including comments within their expressions. Renaming a column rewrites identifier references in checks without changing string literals or function names. Dropping a column drops a check owned by that column, and raises ``TransformError`` if a remaining check depends on it. (:issue:`762`)
- ``table.transform()`` now preserves comments immediately before or after column definitions. These comments move with the column if it is renamed or reordered, and are removed if the column is dropped. (:issue:`762`)
- ``table.transform(rename=...)`` now preserves explicit indexes on renamed columns by dropping and recreating those indexes against the new column names. Previously this raised a ``TransformError``. (:issue:`822`)
- ``table.transform()`` now works for tables that are referenced by views. Previously the ``ALTER TABLE ... RENAME TO`` step raised ``no such table`` if a view referenced the table being transformed. View definitions are left unchanged - see :ref:`python_api_transform_views`. This also fixes a bug where ``transform(keep_table=...)`` silently rewrote dependent views to point at the frozen backup table instead of the live one. (:issue:`831`)
- ``table.default_values`` now unescapes doubled single quotes in string defaults, so a default such as ``'O''Brien'`` is returned as ``"O'Brien"``. Thanks, `ikatyal2110 <https://github.com/ikatyal2110>`__. (`#811 <https://github.com/simonw/sqlite-utils/pull/811>`__)
- ``table.default_values`` now decodes unquoted ``TRUE``, ``FALSE`` and ``NULL`` default literals as ``True``, ``False`` and ``None`` respectively. (:issue:`836`)