pip install -r requirements.txt

python signup.py

curl -X POST -H "Content-Type: application/json" -d '{"userid":"[userid]", "password":"[password]"}' http://127.0.0.1:5000/signup
curl -X POST -H "Content-Type: application/json" -d '{"userid":"[userid]", "password":"[password]"}' http://127.0.0.1:5000/signin

$python

>>> import db_operation
>>> db_operation.check_all_db()