public enum FeatureInputType
{
    CheckBox = 1,
    Number = 2,
    DropDownList = 3
}

public class Feature : Entity
{
    public string Name { get; set; }
    public string DisplayName { get; set; }
    public string NormalizedDisplayName { get; set; }
    public string DefaultValue { get; set; }
    public int DisplayOrder { get; set; }
    public string Description { get; set; }
    public FeatureInputType InputType { get; set; } = FeatureInputType.CheckBox;
    /// <summary>
    /// gets and sets items of feature as string json when InputType is DropDownList
    /// </summary>
    public string Items { get; set; }
}

public class Edition : Entity
{
    public string Title { get; set; }
    public string NormalizedTitle { get; set; }
    public bool IsFree { get; set; }
    public decimal? MonthlyPrice { get; set; }
    public decimal? YearlyPrice { get; set; }
    public bool IsTrialActive { get; set; }
    public int? TrialDaysCount { get; set; }
    public string Description { get; set; }
    public int DisplayOrder { get; set; }
    public byte[] RowVersion { get; set; }

    public ICollection<EditionFeatureSetting> Features { get; set; } = new HashSet<EditionFeatureSetting>();
}

//for TPH inheritance style
public abstract class FeatureSetting : Entity
{
    public string Value { get; set; }

    public Feature Feature { get; set; }
    public long FeatureId { get; set; }
}

public class EditionFeatureSetting : FeatureSetting
{
    public long? EditionId { get; set; }
    public Edition Edition { get; set; }
}

public class CustomerFeatureSetting : FeatureSetting
{
    public long? CustomerId { get; set; }
    public Customer Customer { get; set; }
}

public class Customer : Entity
{
    public string Name { get; set; }
    public string NormalizedName { get; set; }
    public byte[] LogoFile { get; set; }
    public bool IsInTrialPeriod { get; set; }
    public DateTimeOffset SubscriptionStartDate { get; set; }
    public DateTimeOffset? SubscriptionEndDate { get; set; }
    public string PublicKey { get; set; }
    public string PrivateKey { get; set; }
    public byte[] RowVersion { get; set; }

    public long EditionId { get; set; }
    public Edition Edition { get; set; }
    public ICollection<ModelingTemplate> Templates { get; set; } = new HashSet<ModelingTemplate>();
    public ICollection<CustomerFeatureSetting> Features { get; set; } = new HashSet<CustomerFeatureSetting>();
}