### DDL 创建
```sql
CREATE TABLE agent_enterprise_relation  
(  
    id         INT AUTO_INCREMENT PRIMARY KEY,  
    agent_id   INT       NOT NULL,  
    ent_id     INT       NOT NULL,  
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,  
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,  
    UNIQUE KEY idx_agent_ent (agent_id, ent_id)  
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
```

### DDL修改
```sql

```