테스트 DB 계약과 실행 안전성 정렬

src/KArtSell.Modules.ModelOperations/Features/ApproveModel/Handler.cs

@@ -23,20 +23,22 @@ public sealed class Handler(IDbConnectionFactory connectionFactory, IClock clock
             throw new InvalidOperationException($"Approval status is {existing.Value.Status}, not Pending");
 
         // Update approval status (trigger will set approved_at)
-        var now = clock.UtcNow.DateTime;
+        var now = MarketTime.SeoulDateTime(clock.UtcNow);
         await connection.ExecuteAsync("""
             UPDATE model_operations.approval_queue
             SET
                 status = 'Approved',
                 approved_by = @ApprovedBy,
-                approval_reason = @ApprovalReason
+                approval_reason = @ApprovalReason,
+                approved_at = @ApprovedAt
             WHERE run_id = @RunId
             """,
             new
             {
                 request.RunId,
                 ApprovedBy = approverUserId,
-                request.ApprovalReason
+                request.ApprovalReason,
+                ApprovedAt = now
             });
 
         return new Response(

src/KArtSell.Modules.ModelOperations/Features/RejectModel/Handler.cs

@@ -23,18 +23,20 @@ public sealed class Handler(IDbConnectionFactory connectionFactory, IClock clock
             throw new InvalidOperationException($"Approval status is {existing.Value.Status}, not Pending");
 
         // Update approval status (trigger will set rejected_at)
-        var now = clock.UtcNow.DateTime;
+        var now = MarketTime.SeoulDateTime(clock.UtcNow);
         await connection.ExecuteAsync("""
             UPDATE model_operations.approval_queue
             SET
                 status = 'Rejected',
-                rejection_reason = @RejectionReason
+                rejection_reason = @RejectionReason,
+                rejected_at = @RejectedAt
             WHERE run_id = @RunId
             """,
             new
             {
                 request.RunId,
-                request.RejectionReason
+                request.RejectionReason,
+                RejectedAt = now
             });
 
         return new Response(

src/KArtSell.Modules.ModelOperations/Observability/StubObservabilityService.cs

@@ -1,6 +1,8 @@
+using KArtSell.BuildingBlocks.Time;
+
 namespace KArtSell.Modules.ModelOperations.Observability;
 
-public sealed class StubObservabilityService : IObservabilityService
+public sealed class StubObservabilityService(IClock clock) : IObservabilityService
 {
     public async Task<ObservabilityMetricsDto> GetMetricsAsync(CancellationToken cancellationToken)
     {
@@ -23,7 +25,7 @@ public sealed class StubObservabilityService : IObservabilityService
             DuplicateDetection = new DuplicateDetectionMetrics
             {
                 ConstraintViolationCount = 0,
-                LastDetected = DateTime.UtcNow
+                LastDetected = clock.UtcNow.DateTime
             },
             Reconciliation = new ReconciliationMetrics
             {