Campaign_Tracker/Campaign_Tracker.Server/ExtensionData/ILegacyLinkValidator.cs

namespace Campaign_Tracker.Server.ExtensionData;

/// <summary>
/// Validates that a <see cref="LegacyLinkReference"/> resolves to an existing legacy record
/// before an extension record is persisted (AC #3).
/// </summary>
public interface ILegacyLinkValidator
{
    Task<LegacyLinkValidationResult> ValidateAsync(
        LegacyLinkReference reference,
        CancellationToken cancellationToken = default);
}