diff --git a/src/blackboard/db.py b/src/blackboard/db.py
index a926ada..aa4a6dd 100644
--- a/src/blackboard/db.py
+++ b/src/blackboard/db.py
@@ -20,6 +20,8 @@ def init_db(db_path: Path) -> None:
         _migrate_v27(conn)
         # v2.8 迁移：新状态 + 归档字段
         _migrate_v28(conn)
+        # v2.9 迁移：events 表加 payload 列
+        _migrate_v29(conn)
         conn.commit()
     finally:
         conn.close()