app.CreatePerOwinContext(
             () => SmObjectFactory.Container.GetInstance<IApplicationUserManager>());

Install-Package DNTScheduler

ALTER TABLE yourtable DROP CONSTRAINT DF_AspNetUser_UserN__34C8D9D1

ALTER TABLE TableName DROP CONSTRAINT dependent_constraint;

        public MyContext()
        {
            this.Configuration.ProxyCreationEnabled = false;
            this.Configuration.LazyLoadingEnabled = false;
            this.Configuration.AutoDetectChangesEnabled = false;
        }