使用AWS Cognito自动登录

I've developed a backend for our iOS app with AWS, using Cognito for authentication. Currently, the app requires re-authentication each time it is launched cold. I can't store the token as they expire too frequently. I'm considering simply storing the email and password and using it to reauthenticate after the user has signed in once, but this doesn't seem like the most secure idea. I've developed a backend for our iOS app with A