improvement: DeadTokenCleanupWorker Redis 캐시 무효화 연동 (#160)

- ITokenCacheService 주입, 배치 삭제 시 Redis 캐시 무효화
- SELECT → DELETE → 캐시 무효화 순서로 변경
- TASKS.md git 트래킹 해제 (.gitignore에 이미 등록됨)

Closes #160

SPMS.Infrastructure/Workers/DeadTokenCleanupWorker.cs

@@ -2,6 +2,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
+using SPMS.Application.Interfaces;
 using SPMS.Domain.Entities;
 using SPMS.Infrastructure.Persistence;
 
@@ -10,6 +11,7 @@ namespace SPMS.Infrastructure.Workers;
 public class DeadTokenCleanupWorker : BackgroundService
 {
     private readonly IServiceScopeFactory _scopeFactory;
+    private readonly ITokenCacheService _tokenCache;
     private readonly ILogger<DeadTokenCleanupWorker> _logger;
 
     private static readonly TimeZoneInfo KstZone = TimeZoneInfo.FindSystemTimeZoneById("Asia/Seoul");
@@ -18,9 +20,11 @@ public class DeadTokenCleanupWorker : BackgroundService
 
     public DeadTokenCleanupWorker(
         IServiceScopeFactory scopeFactory,
+        ITokenCacheService tokenCache,
         ILogger<DeadTokenCleanupWorker> logger)
     {
         _scopeFactory = scopeFactory;
+        _tokenCache = tokenCache;
         _logger = logger;
     }
 
@@ -99,23 +103,38 @@ public class DeadTokenCleanupWorker : BackgroundService
             return;
         }
 
-        // 배치 삭제 (1000건씩, 트랜잭션 없음)
+        // 배치 삭제 (1000건씩, 트랜잭션 없음) + Redis 캐시 무효화
         var totalDeleted = 0;
-        int deletedInBatch;
 
-        do
+        while (!stoppingToken.IsCancellationRequested)
         {
-            deletedInBatch = await context.Database.ExecuteSqlRawAsync(
-                "DELETE FROM Device WHERE is_active = false AND updated_at < {0} LIMIT 1000",
-                new object[] { cutoffUtc },
+            var batch = await context.Set<Device>()
+                .Where(d => !d.IsActive && d.UpdatedAt < cutoffUtc)
+                .Select(d => new { d.Id, d.ServiceId })
+                .Take(BatchSize)
+                .ToListAsync(stoppingToken);
+
+            if (batch.Count == 0)
+                break;
+
+            var ids = batch.Select(b => b.Id).ToList();
+            var idList = string.Join(",", ids);
+
+            #pragma warning disable EF1002 // ID는 내부 DB 쿼리에서 추출한 long 값 — SQL injection 위험 없음
+            var deletedInBatch = await context.Database.ExecuteSqlRawAsync(
+                $"DELETE FROM Device WHERE id IN ({idList})",
                 stoppingToken);
+            #pragma warning restore EF1002
 
             totalDeleted += deletedInBatch;
 
-            if (deletedInBatch > 0)
-                _logger.LogInformation("DeadTokenCleanupWorker 배치 삭제: {BatchCount}건 (누적: {TotalDeleted}건)",
-                    deletedInBatch, totalDeleted);
-        } while (deletedInBatch > 0 && !stoppingToken.IsCancellationRequested);
+            // 삭제된 디바이스의 Redis 캐시 무효화
+            foreach (var item in batch)
+                await _tokenCache.InvalidateAsync(item.ServiceId, item.Id);
+
+            _logger.LogInformation("DeadTokenCleanupWorker 배치 삭제: {BatchCount}건 (누적: {TotalDeleted}건), 캐시 무효화 완료",
+                deletedInBatch, totalDeleted);
+        }
 
         await WriteSystemLogAsync(context, totalDeleted, stoppingToken);