diff --git a/scripts/create_tables.py b/scripts/create_tables.py
index 8f60728..85f5a44 100644
--- a/scripts/create_tables.py
+++ b/scripts/create_tables.py
@@ -90,6 +90,9 @@ async def main():
                 s = re.sub(r'(?i)CREATE\s+TABLE\s+(`?\w+`?)', r'CREATE TABLE IF NOT EXISTS \1', s)
                 if not s.strip():
                     continue
+                # 跳过索引/约束语句（表已存在时索引也已存在，重复建会 Duplicate key name）
+                if re.match(r'(?i)\s*(CREATE\s+(UNIQUE\s+)?INDEX|ALTER\s+TABLE)', s):
+                    continue
                 await sor.execute(s, {})
                 n += 1
             print(f'  tables: {mod} ensured ({n} statements, idempotent)')