The Wikibase-Quality extensions define a couple of database tables that need review before deployment. The table definitions can be found here (linking the v1 branch designated for deployment):
* https://git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikidataQuality/v1/sql%2Fcreate_wbq_evaluation.sql
* https://git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikidataQuality/v1/sql%2Fcreate_wbq_violations.sql
* https://git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikidataQualityExternalValidation/v1/sql%2Fcreate_wbqev_dump_information.sql
* https://git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikidataQualityExternalValidation/v1/sql%2Fcreate_wbqev_external_data.sql
* https://git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikidataQualityExternalValidation/v1/sql%2Fcreate_wbqev_identifier_properties.sql
* https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FWikidataQualityConstraints/v1/sql%2Fcreate_wbqc_constraints.sql
Code running queries against these can be found here:
* WikidataQuality: includes/Violations/SqlViolationRepo.php
* WikidataQualityConstraints: includes/ConstraintRepository.php
* WikidataQualityExternalValidation: includes/ExternalDataRepo.php
* WikidataQualityExternalValidation: includes/DumpMetaInformation/DumpMetaInformationRepo.php