- Soft‑deprecate the `database` kwarg in `connected_to` by removing its documentation, signaling removal in Rails 6.2.
- Add new features: beginless range support (Ruby 2.7), PostgreSQL 11+ partitioned index handling, queue‑name support for the Que adapter, and restore the `Rails::Application.eager_load!` helper.
- Fix numerous bugs and improve safety: suppress Ruby 2.7 warnings, prevent frozen strings from `Array#to_sentence`, store advisory locks on a dedicated connection, enforce read‑only errors on :reading connections, and enable view‑template...