Someone is hacking database

[iliabanana]

Hi, I'm running and hosting server version 1.1. On the owlcloud.
Someone regularly attacks the base and removes the characters, everyone writes -1, sometimes admins are assigned, sometimes money ...
Is there any defense or how can I work the project safely? All rear doors have been removed

[lunarmare]

With the information provided I am going to assume you've fell victim to SQL injection. You need to escape any user input that is included in a SQL query. Watch some videos about it.

Good luck.