sqlite-utils 4.0, now with database schema migrations

This morning I released sqlite-utils 4.0, the 124th release of that project and the first major version bump since 3.0 in November 2020. In addition to some small but significant breaking changes (described in this upgrade guide), this version introduces three major features: database migrations, nested transactions (via a new db.atomic() method), and support for compound foreign keys. Database schema migrations using sqlite-utils Schema migrations define a sequence of changes to be made to a…