Release: datasette 1.0a28 (https://github.com/simonw/datasette/releases/tag/1.0a28)

I was upgrading Datasette Cloud to 1.0a27 (https://simonwillison.net/2026/Apr/15/datasette/) and discovered a nasty collection of accidental breakages caused by changes in that alpha. This new alpha addresses those directly:

• Fixed a compatibility bug introduced in 1.0a27 where execute_write_fn() callbacks with a parameter name other than conn were seeing errors. (#2691 (https://github.com/simonw/datasette/issues/2691))

• The database.close() (https://docs.datasette.io/en/latest/internals.html#database-close) method now also shuts down the write connection for that database.

• New datasette.close() (https://docs.datasette.io/en/latest/internals.html#datasette-close) method for closing down all databases and resources associated with a Datasette instance. This is called automatically when the server shuts down. (#2693 (https://github.com/simonw/datasette/pull/2693))

• Datasette now includes a pytest plugin which automatically calls datasette.close() on temporary instances created in function-scoped fixtures and during tests. See Automatic cleanup of Datasette instances (https://docs.datasette.io/en/latest/testing_plugins.html#testing-plugins-autoclose) for details. This helps avoid running out of file descriptors in plugin test suites that were written before the Database(is_temp_disk=True) feature introduced in Datasette 1.0a27. (#2692 (https://github.com/simonw/datasette/issues/2692))

Most of the changes in this release were implemented using Claude Code and the newly released Claude Opus 4.7.

    Tags: datasette (https://simonwillison.net/tags/datasette)