IRepository.cs

public interface IRepository<T>
{
    Task<T?> GetById<TId>(TId id, CancellationToken cancellationToken = default) where TId : notnull;
    Task<T?> GetBySpec(ISpecification<T> specification, CancellationToken cancellationToken = default);
    Task<List<T>> List(CancellationToken cancellationToken = default);
    Task<List<T>> List(ISpecification<T> specification, CancellationToken cancellationToken = default);
    
    Task<T> Add(T entity, CancellationToken cancellationToken = default);
    Task<IEnumerable<T>> AddRange(IEnumerable<T> entities, CancellationToken cancellationToken = default);
    Task Update(T entity, CancellationToken cancellationToken = default);
    Task DeleteAsync(T entity, CancellationToken cancellationToken = default);
    Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
}