For your issue it is quite unclear what you mean with

Automatically restore after the render platform is deployed

Restore from where?

For your issue it is quite unclear what you mean with

Automatically restore after the render platform is deployed

Restore from where?

After successfully deploying and registering, the login information will be deleted after a few hours and will be restored to the registration page.

So basically, your cloud provider is not persisting the database. Am I taking this correctly?

Could you please report all the details we asked in above form (Error Message(s) or Log,Deployment Environment)? It is really hard to remote-debug if don't.
Could you also please share the exact way you are deploying on render?

Render would automatically shutdown idle web services after some delay for the Free tier. Most likely configuration is lost because of this.

https://docs.render.com/free#spinning-down-on-idle

That sounds very much like it. => closing as resolved.
Feel free to reopen if it is not

Render would automatically shutdown idle web services after some delay for the Free tier. Most likely configuration is lost because of this.Render 将在免费层延迟一段时间后自动关闭空闲 Web 服务。很可能因此而丢失了配置。

https://docs.render.com/free#spinning-down-on-idle

I have connected an external database in the environment variables, and the situation is the same.

So basically, your cloud provider is not persisting the database. Am I taking this correctly?因此，基本上，您的云提供商不会持久化数据库。我做对了吗？

Could you please report all the details we asked in above form (Error Message(s) or Log,Deployment Environment)? It is really hard to remote-debug if don't.您能否报告我们在上面表格（ Error Message(s) or Log ， Deployment Environment ）中询问的所有详细信息？如果不这样做，真的很难进行远程调试。 Could you also please share the exact way you are deploying on render?您能否分享一下您在渲染上部署的确切方式？

There were no error logs, the deployment was successful. The deployment method was simply importing the repository, keeping other settings as default, and then deploying.

What is your exact environment? (redacting secrets)

There were no error logs

What are the logs of uptime kuma?
I somewhat doubt that there are no logs.

keeping other settings as default

When I was asking about the Deployment Environment, I was specifically asking what you consider those defaults.
Remember that I don't use render => don't know what these defaults are…

There were no error logs

What are the logs of uptime kuma? I somewhat doubt that there are no logs.

keeping other settings as default

When I was asking about the Deployment Environment, I was specifically asking what you consider those defaults. Remember that I don't use render => don't know what these defaults are…

This is the settings and Log that I deployed, and I didn't see an error when logging in before

The correct environment variable names (note that these are undocumented and unstable):

UPTIME_KUMA_DB_TYPE=mariadb
UPTIME_KUMA_DB_HOSTNAME=<your-database-hostname>
UPTIME_KUMA_DB_PORT=3306
UPTIME_KUMA_DB_NAME=<your-database-name>
UPTIME_KUMA_DB_USERNAME=<your-database-username>
UPTIME_KUMA_DB_PASSWORD=<your-database-password>

The correct environment variable names (note that these are undocumented and unstable):

UPTIME_KUMA_DB_TYPE=mariadb
UPTIME_KUMA_DB_HOSTNAME=<your-database-hostname>
UPTIME_KUMA_DB_PORT=3306
UPTIME_KUMA_DB_NAME=<your-database-name>
UPTIME_KUMA_DB_USERNAME=<your-database-username>
UPTIME_KUMA_DB_PASSWORD=<your-database-password>

OK,I will try
Thx

I think the issue for using the development builds (not alpha/beta) of uptime kuma is resolved with this.
We can reopen if this is not the case ^^