Updated changelog, refactored unnecessary queries

.docs/changelog.md

dbrepo-auth-service/dbrepo-realm.json

...o-auth-service/listeners/target/create-event-listener.jar

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

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

...rvice/src/main/java/at/tuwien/endpoints/ViewEndpoint.java

.../java/at/tuwien/service/SubsetServiceIntegrationTest.java

...ervices/src/main/java/at/tuwien/mapper/MariaDbMapper.java

...vices/src/main/java/at/tuwien/service/MetricsService.java

.../at/tuwien/service/impl/MetricsServicePrometheusImpl.java

...java/at/tuwien/service/impl/SubsetServiceMariaDbImpl.java

dbrepo-metadata-db/1_setup-schema.sql

dbrepo-ui/bun.lockb

dbrepo-ui/components/table/TableSchema.vue

...-ui/pages/database/[database_id]/table/create/dataset.vue

...o-ui/pages/database/[database_id]/table/create/schema.vue

helm/dbrepo/files/01-setup-schema.sql

helm/dbrepo/files/create-event-listener.jar