fix issues in backend implementions,

auth endpoint now fetches all relevant backend tokens

src/backends/localdb.js

@@ -35,14 +35,6 @@ export default class LocalDB extends DB_BACKEND {
 		writeFileSync(this.#path, JSON.stringify(this.#data));
 	}
 
-	openSession (credentials) {
-		return [];
-	}
-
-	closeSesssion (tokens) {
-		return true;
-	}
-
 	addUser (username, config = null) {
 		config = config || this.#defaultuser;
 		this.#data.users[username] = config;