Fix: OneTimeLinks (#1719)

* fix otls

* one otl per client

* revert some code

* revert some more code, add comments

* adjust migration

src/server/database/repositories/userConfig/schema.ts

@@ -5,6 +5,7 @@ import { wgInterface } from '../../schema';
 
 // default* means clients store it themselves
 export const userConfig = sqliteTable('user_configs_table', {
+  /** same as `wgInterface.name` */
   id: text()
     .primaryKey()
     .references(() => wgInterface.name, {