Fixed some metadata bugs

.jupyter/api_authentication/models/database_dto.py

.jupyter/api_container/models/database_dto.py

.jupyter/api_database/models/database_dto.py

.jupyter/api_database/models/database_modify_dto.py

.jupyter/api_identifier/models/identifier_dto.py

.jupyter/api_query/api/table_data_endpoint_api.py

.jupyter/api_query/models/database_dto.py

.jupyter/api_table/models/table_dto.py

.jupyter/load_test.py

...ce/rest-service/src/test/java/at/tuwien/BaseUnitTest.java

.../main/java/at/tuwien/service/impl/MariaDbServiceImpl.java

...ce/rest-service/src/test/java/at/tuwien/BaseUnitTest.java

...rvices/src/main/java/at/tuwien/mapper/DocumentMapper.java

...api/src/main/java/at/tuwien/api/database/DatabaseDto.java

...c/main/java/at/tuwien/api/database/DatabaseModifyDto.java

...in/java/at/tuwien/api/identifier/IdentifierCreateDto.java

...src/main/java/at/tuwien/api/identifier/IdentifierDto.java

...s/src/main/java/at/tuwien/entities/database/Database.java

...c/main/java/at/tuwien/entities/identifier/Identifier.java

fda-metadata-db/setup-schema.sql