Merge branch 'hotfix/mapping' into 'dev'

.docker/config/dbrepo.conf

.docker/config/enabled_plugins

.docker/config/rabbitmq.conf

.docker/docker-compose.yml

.docs/api/broker-service.md

dbrepo-broker-service/README.md

dbrepo-broker-service/advanced.config

dbrepo-broker-service/enabled_plugins

dbrepo-broker-service/rabbitmq.conf

dbrepo-dashboard-service/dashboards/system.json

dbrepo-dashboard-service/grafana.ini

...ice/src/main/java/at/tuwien/endpoints/AccessEndpoint.java

...ice/src/main/java/at/tuwien/endpoints/SubsetEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/TableEndpoint.java

...rvice/rest-service/src/main/resources/init/querystore.sql

...service/src/test/java/at/tuwien/config/MariaDbConfig.java

.../test/java/at/tuwien/endpoint/AccessEndpointUnitTest.java

.../test/java/at/tuwien/endpoint/SubsetEndpointUnitTest.java

...c/test/java/at/tuwien/endpoint/TableEndpointUnitTest.java

...ava/at/tuwien/gateway/MetadataServiceGatewayUnitTest.java