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User decision B (log cả 3): mọi thay đổi liên quan HĐ ghi vào unified ContractChangelogs để render tab Lịch sử FE. ## IChangelogService (Application/Common/Interfaces/) 5 methods: - LogContractChangeAsync — Header insert/update - LogDetailChangeAsync — line item insert/update/delete - LogWorkflowTransitionAsync — phase change (parallel với ContractApprovals) - LogCommentAddedAsync — góp ý mới - LogAttachmentAsync — upload/delete file KHÔNG SaveChanges trong service — caller chịu trách nhiệm save atomic cùng business changes (pattern giống INotificationService). ## ChangelogService impl - Resolve actor qua ICurrentUser → UserManager.FindByIdAsync - Denormalize UserName (FullName ?? Email) cho log readable - null UserId = system action (vd SLA auto-approve) - DI: AddScoped trong DependencyInjection.cs ## Wiring vào handlers hiện tại - ContractWorkflowService.TransitionAsync — LogWorkflowTransitionAsync sau khi insert ContractApproval - CreateContractCommandHandler — LogContractChangeAsync(Insert) - UpdateContractDraftCommandHandler — diff GiaTri/TenHopDong/NoiDung/ TemplateId trước update, log update với fieldChangesJson nếu có thay đổi - AddCommentCommandHandler — LogCommentAddedAsync - UploadContractAttachmentCommandHandler — LogAttachmentAsync(Insert) - DeleteContractAttachmentCommandHandler — LogAttachmentAsync(Delete) Build: dotnet build BE pass (0 error, 2 pre-existing warning trong DocxRenderer.cs) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>