ruby on rails devise gem where is the database

i had follow the tutorial of devise in: http://ift.tt/LkuK7q

everything works fine, perfect.

i create i new user in the page: email, password, works fine, i can login with the password and email, i just wanna know where is saving that, i tried find the sqlite database but i could not find anything.

$sqlite3 sqlite> .databases seq name file

---

0 main

i would like know where is saving the users and passwords, and why i cant see a database there.

thanks in advantage guys.