{
  "id": "m0004",
  "title": "pipeline_deliverables.created_by 加宽 32→64（根治 1406 溢出：技术写者交付件落不了库）",
  "backup_tables": ["pipeline_deliverables"],
  "up": [
    {"op": "sql", "sql": "ALTER TABLE pipeline_deliverables MODIFY created_by VARCHAR(64) COMMENT '创建人(agent实例id)'"}
  ],
  "down": [
    {"op": "sql", "sql": "ALTER TABLE pipeline_deliverables MODIFY created_by VARCHAR(32) COMMENT '创建人'"}
  ]
}