Are there any Ruby gems/libraries that help you migrate from an old DB structure to a new structure? ActiveRecord migrations do a good job keeping track of a new db structure, but I wonder if there's something that helps you migrate an entire legacy db to a new structure:Are there any Ruby gems/libraries that help you
阅读背景：
是否有Ruby数据库迁移gem，它可以帮助您将内容从旧结构移动到新结构？
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