public AppDbContext(DbContextOptions <AppDbContext> options, ILogger <AppDbContext> logger)
: base(options)
{
// This actually creates and initializes the database.
Database.EnsureCreated();
_logger = logger;
_logger.LogInformation($"############ Made an instance of AppDbContext (instance #{++_instanceCount})");
_logger.LogInformation($"############ Table Todo has {Todo.CountAsync().Result} records.)");
}