DB query seen for each request using programatic authentication

<jdbc-realm name="myappRealm">
                    <principal-query sql="SELECT r.role, u.password FROM user u join user_role_auth r on r.email = u.email where u.email=?" data-source="myds">
                        <attribute-mapping>
                            <attribute to="Roles" index="1"/>
                        </attribute-mapping>
                        <simple-digest-mapper password-index="2"/>
                    </principal-query>
                </jdbc-realm>

2017-11-30 09:31:04,049 TRACE [org.wildfly.security] (default task-124) Principal assigning: [alberto@myapp.com], pre-realm rewritten: [alberto@myapp.com], realm name: [wmtRealm], post-realm rewritten: [alberto@myapp.com], realm rewritten: [alberto@myapp.com]
2017-11-30 09:31:04,049 TRACE [org.wildfly.security] (default task-124) Executing principalQuery select password from user where email = ? with value alberto@myapp.com
2017-11-30 09:31:04,051 TRACE [org.wildfly.security] (default task-124) Executing principalQuery select role, 'Roles' from user_role_auth where email = ? with value alberto@myapp.com
2017-11-30 09:31:04,052 TRACE [org.wildfly.security] (default task-124) Executing principalQuery select password from user where email = ? with value alberto@myapp.com
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Role mapping: principal [alberto@myapp.com] -> decoded roles [Administrator] -> realm mapped roles [Administrator] -> domain mapped roles [Administrator]
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Authorizing principal alberto@myapp.com.
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Authorizing against the following attributes: [roles] => [Administrator]
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Permission mapping: identity [alberto@myapp.com] with roles [Administrator] implies ("org.wildfly.security.auth.permission.LoginPermission" "") = true
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Authorization succeed
2017-11-30 09:31:04,053 TRACE [org.wildfly.security] (default task-124) Role mapping: principal [alberto@myapp.com] -> decoded roles [Administrator] -> realm mapped roles [Administrator] -> domain mapped roles [Administrator]
2017-11-30 09:31:07,017 TRACE [org.wildfly.security] (default task-125) Principal assigning: [alberto@myapp.com], pre-realm rewritten: [alberto@myapp.com], realm name: [wmtRealm], post-realm rewritten: [alberto@myapp.com], realm rewritten: [alberto@myapp.com]
2017-11-30 09:31:07,018 TRACE [org.wildfly.security] (default task-125) Executing principalQuery select password from user where email = ? with value alberto@myapp.com
2017-11-30 09:31:07,019 TRACE [org.wildfly.security] (default task-125) Executing principalQuery select role, 'Roles' from user_role_auth where email = ? with value alberto@myapp.com
2017-11-30 09:31:07,021 TRACE [org.wildfly.security] (default task-125) Executing principalQuery select password from user where email = ? with value alberto@myapp.com
2017-11-30 09:31:07,022 TRACE [org.wildfly.security] (default task-125) Role mapping: principal [alberto@myapp.com] -> decoded roles [Administrator] -> realm mapped roles [Administrator] -> domain mapped roles [Administrator]
2017-11-30 09:31:07,022 TRACE [org.wildfly.security] (default task-125) Authorizing principal alberto@myapp.com.
2017-11-30 09:31:07,023 TRACE [org.wildfly.security] (default task-125) Authorizing against the following attributes: [roles] => [Administrator]
2017-11-30 09:31:07,023 TRACE [org.wildfly.security] (default task-125) Permission mapping: identity [alberto@myapp.com] with roles [Administrator] implies ("org.wildfly.security.auth.permission.LoginPermission" "") = true
2017-11-30 09:31:07,023 TRACE [org.wildfly.security] (default task-125) Authorization succeed
2017-11-30 09:31:07,023 TRACE [org.wildfly.security] (default task-125) Role mapping: principal [alberto@myapp.com] -> decoded roles [Administrator] -> realm mapped roles [Administrator] -> domain mapped roles [Administrator]