Developers managing ASP.NET Core applications often struggle with post-deployment tasks that EF Core migrations can't handle, like seeding data or creating file structures. A new open-source library addresses this by introducing application-level versioning. It allows developers to write versioned C# migrations for application state, running after schema changes. This approach treats application logic with the same discipline as database structure, solving common update headaches.

EF Core migrations excel at schema changes but fall short on data transformation or one-time setup tasks. The library provides explicit versioning using System.Version and full dependency injection support. It includes a FirstTime flag to guard operations that should only run once, making development iteration faster while preventing duplicate executions in production environments.

For multi-server deployments, the engine offers a ShouldRun property to designate a single instance as master, preventing race conditions without distributed locks. Real-world use cases include seeding initial data after schema updates, migrating configuration formats, and notifying administrators on major upgrades. The author deliberately omitted rollback methods, favoring forward-fixing migrations for reliability.