db - fix deprecation warnings and index timestamps

bin/database/models.js

@@ -86,7 +86,7 @@ models.authCode = new Schema({
 	applicationId: Schema.Types.ObjectId, // reference to application
 	userId: Schema.Types.ObjectId, // reference to user
 	token: String, // generated token, only usable in combination with userId and applicationId
-	timestamp: { type: Date, default: Date.now }
+	timestamp: { type: Date, default: Date.now, index: {unique: true, expires: '5m'} }
 });
 
 module.exports = (con) => {

bin/database/module.js

@@ -33,7 +33,8 @@ methods.connect = async () => {
 	mongoose.connect(cfg.mongoose.uri, {
 		useNewUrlParser: true,
 		useUnifiedTopology: true,
-		useFindAndModify: false
+		useFindAndModify: false,
+		useCreateIndex: true
 	});