Explain what the migration mechanism in Entity Framework Core is and how it is used to manage database changes.

The migration mechanism in Entity Framework Core allows managing changes to the database schema (creating, modifying tables, indexes, relationships) based on changes in the application's data models.

How it works:

1. The developer modifies the models (entity classes).
2. Using the command Add-Migration or dotnet ef migrations add, a migration is created — a class describing the changes.
3. The command Update-Database applies the migrations to the database, synchronizing its structure with the models.

This allows:

• Versioning database changes.
• Automating schema updates during deployment.
• Rolling back changes if necessary.

Example commands:

dotnet ef migrations add AddNewColumnToUsers
dotnet ef database update