feat: 云厂商SDK适配层（Vultr/DO/Cloudflare/阿里云/腾讯云）+ 同步服务 + 测试连接/同步接口与前端

app/database.py

@@ -47,6 +47,19 @@ def init_db() -> None:
     SQLModel.metadata.create_all(
         metrics_engine, tables=[m.__table__ for m in metric_models]
     )
+    _migrate_assets_db()
+
+
+def _migrate_assets_db() -> None:
+    """轻量迁移：为已有 assets 表补充新增列（SQLite create_all 不会修改已有表结构）"""
+    import sqlalchemy as sa
+
+    with assets_engine.begin() as conn:
+        if not sa.inspect(conn).has_table("assets"):
+            return
+        cols = {c["name"] for c in sa.inspect(conn).get_columns("assets")}
+        if "external_id" not in cols:
+            conn.execute(sa.text("ALTER TABLE assets ADD COLUMN external_id VARCHAR"))
 
 
 def get_session() -> Generator[Session, None, None]: