using System; namespace QuantEngine.Core.Models { public class WorkspaceChangeLog { public int Id { get; set; } public string Domain { get; set; } = string.Empty; public string Action { get; set; } = string.Empty; public string TargetRef { get; set; } = string.Empty; public string Actor { get; set; } = "system"; public string Note { get; set; } = string.Empty; public string BeforeJson { get; set; } = "null"; public string AfterJson { get; set; } = "null"; public string CreatedAt { get; set; } = string.Empty; } }