public static void DeleteContributions(this BikeDataDbContext dbContext, List <Contribution> contributions, List <UserContribution> userContributions)
        {
            dbContext.UserContributions.RemoveRange(userContributions);
            dbContext.Contributions.RemoveRange(contributions);

            dbContext.SaveChanges();
        }
 public static void SaveChanges(this BikeDataDbContext dbContext) => dbContext.SaveChanges();