diff --git a/business-css/src/main/java/com/yfd/business/css/CriticalScenarioApplication.java b/business-css/src/main/java/com/yfd/business/css/CriticalScenarioApplication.java
index fa78bca..dfc85fe 100644
--- a/business-css/src/main/java/com/yfd/business/css/CriticalScenarioApplication.java
+++ b/business-css/src/main/java/com/yfd/business/css/CriticalScenarioApplication.java
@@ -6,6 +6,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 import org.springframework.boot.web.servlet.ServletComponentScan;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication(
         scanBasePackages = {
@@ -27,6 +28,7 @@ import org.springframework.boot.web.servlet.ServletComponentScan;
         "com.yfd.platform.**.mapper",
         "com.yfd.business.css.**.mapper"
 })
+@EnableScheduling
 public class CriticalScenarioApplication {
     public static void main(String[] args) {
         SpringApplication.run(CriticalScenarioApplication.class, args);
diff --git a/business-css/src/main/java/com/yfd/business/css/controller/CriticalDataController.java b/business-css/src/main/java/com/yfd/business/css/controller/CriticalDataController.java
index 2e845f6..726b1e7 100644
--- a/business-css/src/main/java/com/yfd/business/css/controller/CriticalDataController.java
+++ b/business-css/src/main/java/com/yfd/business/css/controller/CriticalDataController.java
@@ -45,6 +45,9 @@ public class CriticalDataController {
     @PostMapping
     public boolean create(@RequestBody CriticalData data) {
         data.setModifier(currentUsername());
+        if (data.getExtraFeatures() != null && data.getExtraFeatures().isBlank()) {
+            data.setExtraFeatures(null);
+        }
         return criticalDataService.save(data);
     }
 
@@ -82,6 +85,9 @@ public class CriticalDataController {
     public boolean update(@RequestBody CriticalData data) {
         data.setModifier(currentUsername());
         data.setUpdatedAt(LocalDateTime.now());
+        if (data.getExtraFeatures() != null && data.getExtraFeatures().isBlank()) {
+            data.setExtraFeatures(null);
+        }
         return criticalDataService.updateById(data);
     }
 
diff --git a/business-css/src/main/java/com/yfd/business/css/service/impl/ModelTrainServiceImpl.java b/business-css/src/main/java/com/yfd/business/css/service/impl/ModelTrainServiceImpl.java
index fc89a60..dc2baad 100644
--- a/business-css/src/main/java/com/yfd/business/css/service/impl/ModelTrainServiceImpl.java
+++ b/business-css/src/main/java/com/yfd/business/css/service/impl/ModelTrainServiceImpl.java
@@ -1,6 +1,7 @@
 package com.yfd.business.css.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.type.TypeReference;
@@ -19,6 +20,7 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.scheduling.annotation.Async;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.client.HttpStatusCodeException;
@@ -78,6 +80,7 @@ public class ModelTrainServiceImpl extends ServiceImpl<ModelTrainTaskMapper, Mod
     private static final Pattern DERIVED_EXPR_ALLOWED_PATTERN = Pattern.compile("^[A-Za-z0-9_+\\-*/()\\s]+$");
     private static final int MAX_TRAINING = 2;
     private static final int MAX_PENDING = 5;
+    private static final int TRAINING_TIMEOUT_MINUTES = 120;
 
     @Override
     public String uploadDataset(MultipartFile file) {
@@ -188,7 +191,7 @@ public class ModelTrainServiceImpl extends ServiceImpl<ModelTrainTaskMapper, Mod
 
     @Override
     public Map<String, Object> checkCapacity() {
-        long training = countByStatus(List.of("Training", "TRAINING"));
+        long training = countActiveTraining();
         long pending = countByStatus(List.of("Pending", "PENDING"));
 
         boolean canSubmit = !(training >= MAX_TRAINING && pending >= MAX_PENDING);
@@ -212,7 +215,7 @@ public class ModelTrainServiceImpl extends ServiceImpl<ModelTrainTaskMapper, Mod
     }
 
     private void assertCapacityForSubmit() {
-        long training = countByStatus(List.of("Training", "TRAINING"));
+        long training = countActiveTraining();
         long pending = countByStatus(List.of("Pending", "PENDING"));
         if (training >= MAX_TRAINING && pending >= MAX_PENDING) {
             throw new BizException(buildCapacityBlockReason(training, pending));
@@ -225,9 +228,28 @@ public class ModelTrainServiceImpl extends ServiceImpl<ModelTrainTaskMapper, Mod
         return this.count(q);
     }
 
+    private long countActiveTraining() {
+        LocalDateTime threshold = LocalDateTime.now().minusMinutes(TRAINING_TIMEOUT_MINUTES);
+        QueryWrapper<ModelTrainTask> q = new QueryWrapper<>();
+        q.in("status", List.of("Training", "TRAINING"));
+        q.ge("updated_at", threshold);
+        return this.count(q);
+    }
+
     private String buildCapacityBlockReason(long training, long pending) {
         return "当前训练中(" + training + ")且等待中(" + pending + ")已达上限，请稍后再试";
     }
+
+    @Scheduled(fixedDelay = 300000)
+    public void recycleTimeoutTrainingTasks() {
+        LocalDateTime threshold = LocalDateTime.now().minusMinutes(TRAINING_TIMEOUT_MINUTES);
+        UpdateWrapper<ModelTrainTask> uw = new UpdateWrapper<>();
+        uw.in("status", List.of("Training", "TRAINING"));
+        uw.lt("updated_at", threshold);
+        uw.set("status", "Failed");
+        uw.setSql("error_log = CONCAT(IFNULL(error_log,''), '\\n[auto-timeout] training timeout at ', NOW())");
+        this.update(uw);
+    }
     
     @Async
     public void asyncCallTrain(ModelTrainTask task) {