{
  "id": "m0001",
  "title": "sd_projects 补 directory_name + default_model 列（项目目录统一机制依赖，9/1 测试已上线）",
  "backup_tables": ["sd_projects"],
  "up": [
    {"op": "sql", "sql": "ALTER TABLE sd_projects ADD COLUMN directory_name VARCHAR(200) NULL COMMENT '项目目录名(创建时定死,解析只读此字段)'"},
    {"op": "sql", "sql": "ALTER TABLE sd_projects ADD COLUMN default_model VARCHAR(128) NULL COMMENT '项目默认模型'"}
  ],
  "down": [
    {"op": "sql", "sql": "ALTER TABLE sd_projects DROP COLUMN default_model"},
    {"op": "sql", "sql": "ALTER TABLE sd_projects DROP COLUMN directory_name"}
  ]
}