No one uses it today, or in the last 5 years or so I presume. You use https://learn.microsoft.com/en-us/ef/core/modeling/#use-data-annotations-to-configure-a-mo

No one uses it today, or in the last 5 years or so I presume. You use https://learn.microsoft.com/en-us/ef/core/modeling/#use-data-annotations-to-configure-a-model https://learn.microsoft.com/en-us/ef/core/modeling/#use-data... This was a completely separate, legacy extension of VS, not EF let alone EF Core.