>Rollback. If a new schema change introduces issues, versioning allows for safer rollbacks to previous stable states, minimizing downtime and impact on users.

>Rollback. If a new schema change introduces issues, versioning allows for safer rollbacks to previous stable states, minimizing downtime and impact on users. Wonderful intention, not always easy/possible to pull off because you're not just managing the stateless structure, but the state which is stored by the structure. Migrations that drop columns by merging their data into another may well lose information and may do so in a way that makes the original data unrecoverable... not mentioning how to decide the information for any records possibly added after the dropping migration, but prior to running the rollback. Sure, there are ways to handle these kind of scenarios, and sometimes in reversible ways... but there comes a point were a rollback looks more like moving forward adding a feature/capability than it does a return to a previous state. Defining the "one true way" for migrations may cause more harm than good despite how convenient it may be. How migrators help you manage scenarios like rollback can vary from tool to tool and is part of the selection process when finding the right tool for your project. I've built a database migrator for my project which implements a non-traditional approach to migrations which works very well for my project, but would cause others to cringe with all sorts of objections. Sometimes an external tool is a better answer than an internal one.