refactor: prevent the potential member count inconsistency issue

Makefile

docker-compose.yml

webapp/backend/apiserver/controllers/crewController.js

webapp/backend/apiserver/controllers/eventController.js

webapp/backend/apiserver/controllers/userController.js

webapp/backend/apiserver/datastore/redis.js

webapp/backend/config/redis.js

webapp/backend/package-lock.json

webapp/backend/package.json