Use imported Redis

src/models/index.js

@@ -43,7 +43,7 @@ db.ROLES = ["user", "admin"];
 const Redis = require('redis');
 const redis = {};
 
-redis.client = redis.createClient({
+redis.client = Redis.createClient({
     host: redisConfig.REDIS_HOST,
     port: redisConfig.REDIS_PORT,
 });