fix(database): upgrade error in pg database

Co-Authored-By: Aqr-K <95741669+Aqr-K@users.noreply.github.com>

database/versions/eaf9cbc49027_2_0_7.py

@@ -18,14 +18,19 @@ depends_on = None
 
 
 def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    # 站点管理、订阅增加下载器选项
-    with contextlib.suppress(Exception):
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+
+    # 检查并添加 site.downloader
+    site_columns = inspector.get_columns('site')
+    if not any(c['name'] == 'downloader' for c in site_columns):
         op.add_column('site', sa.Column('downloader', sa.String(), nullable=True))
+
+    # 检查并添加 subscribe.downloader
+    subscribe_columns = inspector.get_columns('subscribe')
+    if not any(c['name'] == 'downloader' for c in subscribe_columns):
         op.add_column('subscribe', sa.Column('downloader', sa.String(), nullable=True))
 
 
-# ### end Alembic commands ###
-
 def downgrade() -> None:
     pass