Active Record adds the ability to safely remove associations by first deprecating them

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Rails 8 introduces a new feature allowing developers to mark Active Record associations as deprecated using the `deprecated: true` option. This enables safe removal of old associations by providing deprecation warnings when they're accessed, queried, or trigger side effects. The feature supports three modes: warn (logs warnings), raise (throws exceptions), and notify (emits events for external services). Developers can configure these settings globally or per environment, making it easier to phase out legacy associations in large codebases while maintaining safety through gradual deprecation.

Active Record adds support for deprecating associations