{
  "id": "m0038",
  "title": "修正 pipeline_user_secrets 唯一索引(2026-09-17): m0037 把 models 声明的 uk_org_user_name(unique) 误写成普通 CREATE INDEX → 实测建出 KEY 而非 UNIQUE KEY，失去并发去重保护(同名可插重复行、幂等判定失效)。本迁移删除误建的普通索引并按 models JSON 权威定义重建为 UNIQUE。DROP INDEX 用不带 IF EXISTS 的形态(MariaDB 10.6 对 DROP INDEX IF EXISTS 支持不确定，不赌语法)，dmig 的 index_exists 守卫已覆盖幂等",
  "backup_tables": ["pipeline_user_secrets"],
  "up": [
    {
      "op": "sql",
      "sql": "ALTER TABLE pipeline_user_secrets DROP INDEX pipeline_user_secrets_idx_org_user_name"
    },
    {
      "op": "sql",
      "sql": "CREATE UNIQUE INDEX uk_org_user_name ON pipeline_user_secrets(org_id, user_id, name)"
    }
  ],
  "down": [
    {
      "op": "sql",
      "sql": "ALTER TABLE pipeline_user_secrets DROP INDEX uk_org_user_name"
    },
    {
      "op": "sql",
      "sql": "CREATE INDEX pipeline_user_secrets_idx_org_user_name ON pipeline_user_secrets(org_id, user_id, name)"
    }
  ]
}