fix: PostgreSQL 업무 상세 조회의 잠금 충돌 수정

src/main/java/com/fowoco/server/task/application/TaskWorkflowService.java

@@ -240,7 +240,7 @@ public TaskResult findById(UUID taskId, ActorContext actor) {
         return toResult(
                 task,
                 checklistRepository.findAllByTaskIdAndCompanyId(taskId, actor.companyId()),
-                findWorker(task, actor.companyId()),
+                findWorkerReadOnly(task, actor.companyId()),
                 catalogService.requireWorkflow(task.workflowId())
         );
     }
@@ -611,6 +611,13 @@ private WorkerTaskContext findWorker(Task task, UUID companyId) {
                 : null;
     }
 
+    private WorkerTaskContext findWorkerReadOnly(Task task, UUID companyId) {
+        return task.targetType() == TaskTargetType.WORKER
+                ? workerReader.findByIdAndCompanyIdReadOnly(task.workerId(), companyId)
+                        .orElseThrow(() -> new ApiException(TaskErrorCode.WORKER_NOT_FOUND))
+                : null;
+    }
+
     private WorkerTaskContext resolveCreateTarget(
             CreateTaskCommand command,
             WorkflowDefinition workflow,

src/main/java/com/fowoco/server/worker/application/port/WorkerTaskContextReader.java

@@ -7,4 +7,6 @@
 public interface WorkerTaskContextReader {
 
     Optional<WorkerTaskContext> findByIdAndCompanyId(UUID workerId, UUID companyId);
+
+    Optional<WorkerTaskContext> findByIdAndCompanyIdReadOnly(UUID workerId, UUID companyId);
 }

src/main/java/com/fowoco/server/worker/infrastructure/JdbcWorkerTaskContextReader.java

@@ -36,6 +36,18 @@ public Optional<WorkerTaskContext> findByIdAndCompanyId(UUID workerId, UUID comp
             return Optional.empty();
         }
 
+        return findContext(workerId, companyId);
+    }
+
+    @Override
+    public Optional<WorkerTaskContext> findByIdAndCompanyIdReadOnly(
+            UUID workerId,
+            UUID companyId
+    ) {
+        return findContext(workerId, companyId);
+    }
+
+    private Optional<WorkerTaskContext> findContext(UUID workerId, UUID companyId) {
         List<WorkerTaskContext> rows = jdbcTemplate.query(
                 """
                 SELECT worker_id, work_status, stay_expiry_date,

src/test/java/com/fowoco/server/demo/infrastructure/seed/DemoSeedPostgreSqlApplicationIntegrationTest.java

@@ -3,11 +3,16 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import com.fowoco.server.ServerApplication;
+import com.fowoco.server.auth.application.ActorContext;
+import com.fowoco.server.auth.domain.UserRole;
 import com.fowoco.server.common.security.PostgreSqlRlsTestLock;
+import com.fowoco.server.task.application.TaskResult;
+import com.fowoco.server.task.application.TaskWorkflowService;
 import java.nio.file.Path;
 import java.sql.Timestamp;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Set;
 import java.util.UUID;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
@@ -24,6 +29,10 @@ class DemoSeedPostgreSqlApplicationIntegrationTest {
 
     private static final UUID COMPANY_ID =
             UUID.fromString("90000000-0000-0000-0000-000000000001");
+    private static final UUID ADMIN_USER_ID =
+            UUID.fromString("90000000-0000-0000-0000-000000000002");
+    private static final UUID TASK_ID =
+            UUID.fromString("94000000-0000-0000-0000-000000000003");
     private static final UUID REPRESENTATIVE_WORKER_ID =
             UUID.fromString("92000000-0000-0000-0000-000000000006");
     private static final UUID SHOWCASE_CASE_ID =
@@ -67,6 +76,7 @@ void bootsFullDemoSeedUpgradesPreviousReleaseAndRestartsIdempotentlyOnPostgreSql
             )) {
                 JdbcTemplate jdbcTemplate = context.getBean(JdbcTemplate.class);
                 assertGoldenFlowStartState(jdbcTemplate);
+                assertTaskDetailReadable(context);
                 firstBoot = snapshot(jdbcTemplate);
                 emulatePreviousReleaseSeed(jdbcTemplate);
             }
@@ -78,6 +88,7 @@ void bootsFullDemoSeedUpgradesPreviousReleaseAndRestartsIdempotentlyOnPostgreSql
             )) {
                 JdbcTemplate jdbcTemplate = context.getBean(JdbcTemplate.class);
                 assertGoldenFlowStartState(jdbcTemplate);
+                assertTaskDetailReadable(context);
                 assertThat(snapshot(jdbcTemplate)).isEqualTo(firstBoot);
             }
 
@@ -261,6 +272,16 @@ SELECT COUNT(*)
         }
     }
 
+    private void assertTaskDetailReadable(ConfigurableApplicationContext context) {
+        TaskResult result = context.getBean(TaskWorkflowService.class).findById(
+                TASK_ID,
+                new ActorContext(ADMIN_USER_ID, COMPANY_ID, Set.of(UserRole.ADMIN))
+        );
+
+        assertThat(result.task().taskId()).isEqualTo(TASK_ID);
+        assertThat(result.task().workerId()).isNotNull();
+    }
+
     private SeedSnapshot snapshot(JdbcTemplate jdbcTemplate) {
         Map<String, Integer> counts = new LinkedHashMap<>();
         EXPECTED_COUNTS.forEach((table, expected) -> {