Hello.
I want to create a database in KeePass. When I stored that database in App Folder, will it deleted by update?
In every Folder of an App is an "Data" Folder. Or is better to store the database in that Folder. Is the Folder for Userdata?
Sorry for my bad english.

I think you are right. I had the same thing happen during CCleaner update. I had a file winapp2.ini which stored custom locations to clean. After update the file was gone. It was stored in the App\CCleaner folder. But the files in \Data\ folder are untouched during update. Better safe than sorry.

P.S. It would be even better if we have an official conformation from the mods Dji or JP4U or from the big guy Skybird himself

terminator1234 answers correctly, this is better to save your configuration, profile, whatever specific to an application customization into its Data subfolder (e.g. Liberkey\Apps\CCLeaner\Data for CCleaner application), not inside its App subfolder which could be "cleaned" for some specific updates (e.g when an application update brokes the existing and deprecated application "structure").