Also, 1Password and KeePass are both free and they both don't use a CSV file, no idea where you got that from. I'm trying to understand why your app would be better.
Mine stores the database in the apps data directory which is on the phones built in storage others apps cannot access another apps data directory.
It's possible a root app can access it but rooting a phone has been known to open the door for security exploits so that would be advised against, Even Google advises against rooting your phone.
Like i said, I'm just looking to get the app indexed, Use it or don't.