bug: 使用postgresql时，会出现标识符大于63字符的错误

```
sqlalchemy.exc.IdentifierError: Identifier 'ix_nonebot_plugin_tetris_stats_historicaldata_user_uniq_c6d0ea69' exceeds maximum length of 63 characters
```

https://github.com/A-Minos/nonebot-plugin-tetris-stats/issues/482