diff --git a/src/KArtSell.Host/Jobs/HistoricalBatchShadowRunJob.cs b/src/KArtSell.Host/Jobs/HistoricalBatchShadowRunJob.cs
new file mode 100644
index 00000000..8c13a1bc
--- /dev/null
+++ b/src/KArtSell.Host/Jobs/HistoricalBatchShadowRunJob.cs
@@ -0,0 +1,87 @@
+using Hangfire;
+using KArtSell.BuildingBlocks.Time;
+using KArtSell.Modules.ModelOperations.ShadowRun;
+using Microsoft.Extensions.Logging;
+
+namespace KArtSell.Host.Jobs;
+
+/// <summary>
+/// Historical batch shadow run: processes full 1-year past data in single job.
+///
+/// Usage: Manually trigger or schedule daily at off-peak (e.g., 21:00 KST).
+/// Invokes ShadowRunJob with 1-year date range to complete Phase 1 validation.
+///
+/// Idempotency: Each run generates unique RunId + IdempotencyKey; safe to retry.
+/// </summary>
+public sealed class HistoricalBatchShadowRunJob(
+    IBackgroundJobClient backgroundJobClient,
+    ShadowRunQueries queries,
+    IClock clock,
+    ILogger<HistoricalBatchShadowRunJob> logger)
+{
+    private static readonly Action<ILogger, DateOnly, DateOnly, Exception?> LogHistoricalBatchStarted =
+        LoggerMessage.Define<DateOnly, DateOnly>(
+            LogLevel.Information,
+            new EventId(1, nameof(LogHistoricalBatchStarted)),
+            "Historical batch shadow run initiated: {Start:yyyy-MM-dd} to {End:yyyy-MM-dd}");
+
+    private static readonly Action<ILogger, Guid, string, Exception?> LogBatchJobEnqueued =
+        LoggerMessage.Define<Guid, string>(
+            LogLevel.Information,
+            new EventId(2, nameof(LogBatchJobEnqueued)),
+            "Historical batch job {RunId} enqueued; Hangfire job: {JobId}");
+
+    /// <summary>
+    /// Execute historical batch: load past 1 year of data and validate in single job.
+    /// </summary>
+    [Queue("q-research")]
+    [DisableConcurrentExecution(timeoutInSeconds: 300)]  // 5 min to queue; job itself has 30 min
+    public async Task ExecuteAsync(Guid? modelId = null, CancellationToken cancellationToken = default)
+    {
+        // Use provided modelId or default to all-models sentinel
+        var targetModelId = modelId ?? Guid.Empty;
+
+        // Calculate 1-year window: 252 trading days ≈ 365 calendar days
+        var endDate = DateOnly.FromDateTime(clock.UtcNow.Date);
+        var startDate = endDate.AddDays(-365);  // 1 year back
+
+        LogHistoricalBatchStarted(logger, startDate, endDate, null);
+
+        try
+        {
+            // Create unique run
+            var runId = Guid.NewGuid();
+            var idempotencyKey = Guid.NewGuid();
+            var correlationId = Guid.NewGuid();
+
+            // Pre-insert shadow_run with "Queued" status
+            var createdAt = clock.UtcNow;
+            await queries.InsertShadowRunQueuedAsync(
+                runId,
+                targetModelId,
+                startDate,
+                endDate,
+                createdAt,
+                CancellationToken.None);
+
+            // Enqueue ShadowRunJob with 1-year range
+            var command = new ShadowRunCommand(
+                ModelId: targetModelId,
+                CorrelationId: correlationId,
+                IdempotencyKey: idempotencyKey,
+                WindowStartDate: startDate,
+                WindowEndDate: endDate,
+                PhaseFilter: MarketPhaseFilter.All);
+
+            var jobId = backgroundJobClient.Enqueue<ShadowRunJob>(
+                job => job.ExecuteAsync(command, CancellationToken.None));
+
+            LogBatchJobEnqueued(logger, runId, jobId, null);
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Historical batch shadow run failed to enqueue");
+            throw;
+        }
+    }
+}
diff --git a/src/KArtSell.Host/Jobs/ShadowRunJob.cs b/src/KArtSell.Host/Jobs/ShadowRunJob.cs
index c42adb80..1665f0a7 100644
--- a/src/KArtSell.Host/Jobs/ShadowRunJob.cs
+++ b/src/KArtSell.Host/Jobs/ShadowRunJob.cs
@@ -76,7 +76,7 @@ public sealed class ShadowRunJob(
             "Shadow run {RunId} phase 4 (phase segmentation) complete");
 
     [Queue("q-research")]
-    [DisableConcurrentExecution(timeoutInSeconds: 3600)]  // Max 60 minutes
+    [DisableConcurrentExecution(timeoutInSeconds: 1800)]  // 30 min for bulk historical (252+ days)
     [AutomaticRetry(Attempts = MaxAttempts, OnAttemptsExceeded = AttemptsExceededAction.Fail)]
     public async Task ExecuteAsync(ShadowRunCommand command, CancellationToken cancellationToken = default)
     {
diff --git a/src/KArtSell.Host/Program.cs b/src/KArtSell.Host/Program.cs
index 7c2f4b8c..e1a1a190 100644
--- a/src/KArtSell.Host/Program.cs
+++ b/src/KArtSell.Host/Program.cs
@@ -395,6 +395,7 @@ else
 
 // Register other Hangfire jobs
 var kstTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Asia/Seoul");
+try { RecurringJob.AddOrUpdate<HistoricalBatchShadowRunJob>("historical-batch-shadow-run", job => job.ExecuteAsync(null, CancellationToken.None), "0 21 * * *", new RecurringJobOptions { TimeZone = kstTimeZone }); logger.LogInformation("✅ historical-batch-shadow-run registered (daily 21:00 KST)"); } catch (Exception ex) { logger.LogWarning(ex, "⚠️ historical-batch-shadow-run error"); }
 try { RecurringJob.AddOrUpdate<OpenDartDailyBatchJob>("opendart-daily-batch", job => job.ExecuteAsync(CancellationToken.None), "0 9 * * *", new RecurringJobOptions { TimeZone = kstTimeZone }); logger.LogInformation("✅ opendart-daily-batch registered"); } catch (Exception ex) { logger.LogWarning(ex, "⚠️ opendart-daily-batch error"); }
 try { RecurringJob.AddOrUpdate<GenerateDailyRecommendationJob>("daily-recommendation", job => job.ExecuteAsync(CancellationToken.None), "0 9 * * *", new RecurringJobOptions { TimeZone = kstTimeZone }); logger.LogInformation("✅ daily-recommendation registered"); } catch (Exception ex) { logger.LogWarning(ex, "⚠️ daily-recommendation error"); }
 try { RecurringJob.AddOrUpdate<GenerateWeeklyRecommendationJob>("weekly-recommendation", job => job.ExecuteAsync(CancellationToken.None), "0 9 * * 6", new RecurringJobOptions { TimeZone = kstTimeZone }); logger.LogInformation("✅ weekly-recommendation registered"); } catch (Exception ex) { logger.LogWarning(ex, "⚠️ weekly-recommendation error"); }