// TODO
 private void AddOrSkipExistensSeparationsRange(ICollection <Separation> separations, ICollection <Separation> contextSeparations)
 {
     foreach (var separation in separations)
     {
         if (!contextSeparations.Contains(separation))
         {
             separation.SeparationId = 0;
             Separations.Add(separation);
         }
     }
 }
        public async ValueTask <bool> AddNewSeparationAsync(Separation separation)
        {
            try
            {
                Separations.Add(new Separation()
                {
                    Address = separation.Address
                });

                await SaveChangesAsync();
            }
            catch
            {
                return(false);
            }

            return(true);
        }