Instead of using any default DbContext namespace, you may want to override.
efpt.config.json
"ContextNamespace": null,
NorthwindContext.cs
namespace Ef7Playground;
public partial class NorthwindContext : DbContext
{
efpt.config.json
"ContextNamespace": "Context",
NorthwindContext.cs
namespace Ef7Playground.Context;
public partial class NorthwindContext : DbContext
{