<property name="hibernate.hbm2ddl.auto" value="validate"/>

for

<property name="hibernate.hbm2ddl.auto" value="update"/>

7. create a datasource for both Aerogear UPS and Keycloak:

unifiedpush-ds.xml:

<?xml version="1.0" encoding="UTF-8"?>

<datasources xmlns="http://www.jboss.org/ironjacamar/schema">

  <datasource jndi-name="java:jboss/datasources/UnifiedPushDS" pool-name="UnifiedPushDS" enabled="true" use-java-context="true">

        <connection-url>jdbc:mysql://host:3306/unifiedpush?useUnicode=true&amp;characterEncoding=UTF-8</connection-url>

        <driver>com.mysql</driver>

        <security>

            <user-name>your-username</user-name>

            <password>your-secret</password>

        </security>

  </datasource>

  <datasource jndi-name="java:jboss/datasources/KeycloakDS"

                  pool-name="KeycloakDS" enabled="true" use-java-context="true">

        <connection-url>jdbc:mysql://host:3306/keycloak?useUnicode=true&amp;characterEncoding=UTF-8</connection-url>

        <driver>com.mysql</driver>

        <security>

            <user-name>your-username</user-name>

            <password>your-secret</password>

        </security>

  </datasource>

</datasources>

8. start your server