hm i have a system sorta like this here’s how i achieve it:
i have a webportal where players can mess with their items that they have in-game, and even mess with their character this is all saved to a database (MySql in my case) if a player logs into the game the game loads their character data from this database and assigns the rights meshes to their character as needed (we use ID numbers for everything in the game for easy sorting)
also note that i do not let the players clients touch the database all of their requests (outside of login) runs through one of our servers which can then request the info from the database (we have our server code separated from our client code) and even then the server does not direct tap it either for security purposes.