Create a new command /inv sync <flatfile/mysql> <mysql/flatfile>

• You can synchronize between the databases with this command.
• It won't delete the existing data, just add the rest from the other database.
• In both cases the config.yml "database-type" section must be mysql. And the plugin must connect to the mysql server.
• Of course, all this happnes in asnyc.

You have to complement the language.yml file with these lines:
Permission: invsaver.command.sync