{
  "id": "m0022",
  "title": "pipeline_conversations 归籍 pipeline-service + collation 统一 unicode_ci（消灭代码里的 COLLATE 补丁依赖）",
  "backup_tables": ["pipeline_conversations"],
  "up": [
    {"op": "sql", "sql": "ALTER TABLE pipeline_conversations CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci"}
  ],
  "down": [
    {"op": "sql", "sql": "ALTER TABLE pipeline_conversations CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci"}
  ]
}