Avoid remove the last user

[MontejoJorge]

First Check

• I used the GitHub search to find a similar requests and didn't find it.
• Checked the tasks tagged issues and verified my feature is not covered

Please provide a concise description of the problem that would be addressed by this feature.

If there is only one user left you can delete it, so you wont be able to login again.

Please provide a concise description of the feature that would resolve your issue.

If there is only one user left, warn or avoid to delete it by the user.

Please consider and list out some caveats or tradeoffs made in your design decision

N/A.

Additional Information

• If this is accepted I'm willing to submit a PR to provide this feature
• If this is accepted I'm willing to help maintain this feature
• I'm willing to sponsor/pay a developer to do this work