'DatabaseErrorPageExtensions.UseDatabaseErrorPage(IApplicationBuilder)' is obsolete: 'This is obsolete and will be removed in a future version. Use DatabaseDeveloperPageExceptionFilter instead, see documentation at https://aka.ms/DatabaseDeveloperPageExceptionFilter.'

Non-nullable property 'PersonnelNumber' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Name' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Position' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Department' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'BookEntries' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Calling 'BuildServiceProvider' from application code results in an additional copy of singleton services being created. Consider alternatives such as dependency injecting services as parameters to 'Configure'. (https://aka.ms/AA5k895)