diff --git a/backend/competition/migrations/0012_alter_competition_cover_image_url_and_more.py b/backend/competition/migrations/0012_alter_competition_cover_image_url_and_more.py
new file mode 100644
index 0000000..91ff98e
--- /dev/null
+++ b/backend/competition/migrations/0012_alter_competition_cover_image_url_and_more.py
@@ -0,0 +1,23 @@
+# Generated by Django 6.0.1 on 2026-03-22 16:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('competition', '0011_increase_file_url_length'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='competition',
+            name='cover_image_url',
+            field=models.CharField(blank=True, help_text='优先使用上传的图片', max_length=1000, null=True, verbose_name='封面图URL'),
+        ),
+        migrations.AlterField(
+            model_name='project',
+            name='cover_image_url',
+            field=models.CharField(blank=True, help_text='优先使用上传的图片', max_length=1000, null=True, verbose_name='项目封面URL'),
+        ),
+    ]
diff --git a/backend/competition/models.py b/backend/competition/models.py
index 0142478..61ee049 100644
--- a/backend/competition/models.py
+++ b/backend/competition/models.py
@@ -27,7 +27,7 @@ class Competition(models.Model):
     condition_description = models.TextField(verbose_name="参赛条件说明", blank=True)
     
     cover_image = models.ImageField(upload_to='competitions/covers/', verbose_name="封面图", null=True, blank=True)
-    cover_image_url = models.URLField(verbose_name="封面图URL", null=True, blank=True, help_text="优先使用上传的图片")
+    cover_image_url = models.CharField(max_length=1000, verbose_name="封面图URL", null=True, blank=True, help_text="优先使用上传的图片")
     
     start_time = models.DateTimeField(verbose_name="开始时间")
     end_time = models.DateTimeField(verbose_name="结束时间")
@@ -156,7 +156,7 @@ class Project(models.Model):
     team_info = models.TextField(verbose_name="团队介绍", blank=True)
     
     cover_image = models.ImageField(upload_to='competitions/projects/covers/', verbose_name="项目封面", null=True, blank=True)
-    cover_image_url = models.URLField(verbose_name="项目封面URL", null=True, blank=True, help_text="优先使用上传的图片")
+    cover_image_url = models.CharField(max_length=1000, verbose_name="项目封面URL", null=True, blank=True, help_text="优先使用上传的图片")
     
     status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='draft', verbose_name="状态")
     
diff --git a/backend/config/settings.py b/backend/config/settings.py
index fb4a058..d7cd9f8 100644
--- a/backend/config/settings.py
+++ b/backend/config/settings.py
@@ -119,16 +119,16 @@ if DB_HOST:
     }
 
 
-# DB_HOST = os.environ.get('DB_HOST', '121.43.104.161')
-# if DB_HOST:
-#     DATABASES['default'] = {
-#         'ENGINE': 'django.db.backends.postgresql',
-#         'NAME': os.environ.get('DB_NAME', 'market'),
-#         'USER': os.environ.get('DB_USER', 'market'),
-#         'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
-#         'HOST': DB_HOST,
-#         'PORT': os.environ.get('DB_PORT', '6433'),
-#     }
+DB_HOST = os.environ.get('DB_HOST', '121.43.104.161')
+if DB_HOST:
+    DATABASES['default'] = {
+        'ENGINE': 'django.db.backends.postgresql',
+        'NAME': os.environ.get('DB_NAME', 'market'),
+        'USER': os.environ.get('DB_USER', 'market'),
+        'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
+        'HOST': DB_HOST,
+        'PORT': os.environ.get('DB_PORT', '6433'),
+    }
 
 
 # Password validation