17th April 2026 I was upgrading Datasette Cloud to 1.0a27 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 thanconn were seeing errors. (#2691)- The database.close() method now also shuts down the write connection for that database. - New 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) - 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 for details. This helps avoid running out of file descriptors in plugin test suites that were written before theDatabase(is_temp_disk=True) feature introduced in Datasette 1.0a27. (#2692) Most of the changes in this release were implemented using Claude Code and the newly released Claude Opus 4.7..