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public class Competition
{
    public int Id { get; set; }
    [Required] public string UserId { get; set; }
    public string UserName { get; set; }
    public DateTime DateCreated { get; set; }
    public DateTime? DateModified { get; set; }
    [Required] public string Name { get; set; }
}

internal interface IRepository<TEntity> : IDisposable where TEntity : class
{
    IList<TEntity> GetAll();
    TEntity Get(int id);
    void Save(TEntity model);
    void Delete(int id);
}