datasette 1.0a28

# Release: datasette 1.0a28 Source: https://simonwillison.net/2026/Apr/17/datasette/ [Datasette 1.0a28](https://github.com/simonw/datasette/releases/tag/1.0a28) — An open source multi-tool for exploring and publishing data 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.