[keycloak-user] Instalation and configuration dilemmas

Hello, With respect, I'll get straight to the point - I installed Keycloak on remote machine, there I have PostgreSQL database which I want to secure with Keycloak. However, I have 2 doubts. 1) Does Keycloak (4.5.0) require to be used with WildFly server in order to be able to properly secure applications (I will connect to db using Android and iOS apps)? Because AeroGear has tutorials but with 1.1.0 version of Keycloak where WildFly is necessary to secure application. 2) As far as I've understood I need to have some sort of back-end service which will be used to unpack and test permissions written on tokens (cause I don't see how can I use only Keycloak to access to db through it?) and that back-end will take care of db access and Keycloak is only used as token provider as far as I can tell? Am I wrong? If so, how can I use Keycloak to properly secure this db and access it through say Android app? Thank you in advance, Bojan Milosavljevic.