diff --git a/src/api/card_routes.py b/src/api/card_routes.py
index 5577caa..581ac4a 100644
--- a/src/api/card_routes.py
+++ b/src/api/card_routes.py
@@ -26,7 +26,10 @@ def _bb(project_id: str) -> Blackboard:
 
 
 def _card_ops(project_id: str) -> CardOps:
-    return CardOps(_db_path(project_id))
+    from src.blackboard.db import init_db
+    db = _db_path(project_id)
+    init_db(db)  # 确保 DB 已迁移
+    return CardOps(db)
 
 
 def _q(project_id: str) -> Queries: