테스트 DB 계약과 실행 안전성 정렬

src/KArtSell.BuildingBlocks/Time/MarketTime.cs

@@ -0,0 +1,11 @@
+namespace KArtSell.BuildingBlocks.Time;
+
+public static class MarketTime
+{
+    public static DateTime SeoulDateTime(DateTimeOffset utcNow)
+    {
+        var zone = TimeZoneInfo.FindSystemTimeZoneById(
+            OperatingSystem.IsWindows() ? "Korea Standard Time" : "Asia/Seoul");
+        return TimeZoneInfo.ConvertTime(utcNow, zone).DateTime;
+    }
+}

src/KArtSell.Host/Jobs/RecommendationReportGenerator.cs

@@ -1,4 +1,5 @@
 using KArtSell.BuildingBlocks.Data;
+using KArtSell.BuildingBlocks.Time;
 using Microsoft.Extensions.Logging;
 using System.Net.Http;
 
@@ -15,17 +16,20 @@ public sealed class RecommendationReportGenerator
     private readonly IDbConnectionFactory _connectionFactory;
     private readonly HttpClient _httpClient;
     private readonly ILogger<RecommendationReportGenerator> _logger;
+    private readonly IClock _clock;
     private readonly string _telegramBotToken;
     private readonly string _telegramChatId;
 
     public RecommendationReportGenerator(
         IDbConnectionFactory connectionFactory,
         HttpClient httpClient,
-        ILogger<RecommendationReportGenerator> logger)
+        ILogger<RecommendationReportGenerator> logger,
+        IClock clock)
     {
         _connectionFactory = connectionFactory;
         _httpClient = httpClient;
         _logger = logger;
+        _clock = clock;
         _telegramBotToken = Environment.GetEnvironmentVariable("TELEGRAM_BOT") ?? string.Empty;
         _telegramChatId = Environment.GetEnvironmentVariable("CHAT_ID") ?? string.Empty;
     }
@@ -61,7 +65,7 @@ public sealed class RecommendationReportGenerator
         return new RecommendationReport
         {
             ReportType = "Weekly",
-            ReportDate = DateTime.UtcNow,
+            ReportDate = _clock.UtcNow.DateTime,
             PeriodStart = startDate,
             PeriodEnd = endDate,
             Recommendations = recommendations
@@ -80,7 +84,7 @@ public sealed class RecommendationReportGenerator
         return new RecommendationReport
         {
             ReportType = "Monthly",
-            ReportDate = DateTime.UtcNow,
+            ReportDate = _clock.UtcNow.DateTime,
             PeriodStart = startDate,
             PeriodEnd = endDate,
             Recommendations = recommendations

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
             {