namespace SQLInsight.Core.Data;

/// <summary>
/// A snapshot of cumulative counters and, from the second collection on, the change since the previous snapshot.
/// Counters reset when SQL Server restarts (or are cleared manually); the delta is then <see langword="null"/>
/// for one collection instead of producing negative or meaningless numbers.
/// </summary>
public sealed record CumulativeSample<TSnapshot, TDelta>(TSnapshot Snapshot, TDelta? Delta)
    where TSnapshot : class
    where TDelta : class;