diff --git a/ai_knowledge_base_v2/apps/backend/alembic/versions/0008_unique_knowledge_feishu_node.py b/ai_knowledge_base_v2/apps/backend/alembic/versions/0008_unique_knowledge_feishu_node.py
index 06ec548..d2c1e67 100644
--- a/ai_knowledge_base_v2/apps/backend/alembic/versions/0008_unique_knowledge_feishu_node.py
+++ b/ai_knowledge_base_v2/apps/backend/alembic/versions/0008_unique_knowledge_feishu_node.py
@@ -1,20 +1,25 @@
 from __future__ import annotations
 
 from alembic import op
+import sqlalchemy as sa
 
-revision = "0008_unique_knowledge_feishu_node"
+revision = "0008_unique_kb_node"
 down_revision = "0007_knowledge_agent_rebuild"
 branch_labels = None
 depends_on = None
 
 
 def upgrade() -> None:
-    op.create_unique_constraint(
-        "uq_knowledge_feishu_node",
-        "sys_knowledge",
-        ["feishu_space_id", "feishu_node_id"],
-    )
+    constraints = {item["name"] for item in sa.inspect(op.get_bind()).get_unique_constraints("sys_knowledge")}
+    if "uq_knowledge_feishu_node" not in constraints:
+        op.create_unique_constraint(
+            "uq_knowledge_feishu_node",
+            "sys_knowledge",
+            ["feishu_space_id", "feishu_node_id"],
+        )
 
 
 def downgrade() -> None:
-    op.drop_constraint("uq_knowledge_feishu_node", "sys_knowledge", type_="unique")
+    constraints = {item["name"] for item in sa.inspect(op.get_bind()).get_unique_constraints("sys_knowledge")}
+    if "uq_knowledge_feishu_node" in constraints:
+        op.drop_constraint("uq_knowledge_feishu_node", "sys_knowledge", type_="unique")