How One Developer Turned Manual Data Audits Into an Automated Build Step

A developer running a travel site repeatedly found legal-status data drifting out of sync across multiple files and a database, even after thorough manual audits. The core problem was that each audit only certified a snapshot in time, while four separate data writers continued making independent changes with no system enforcing consistency. To fix this, the developer wrote a script that runs before every build, pulling live database tables and comparing them against four static TypeScript files using the app's own parsing logic. The check distinguishes between hard errors — contradictions a user could encounter — which fail the build, and warnings for unmanaged data that may cause future issues. Starting from 28 known conflicts, the baseline was cleared to zero within three days, making any future disagreement an automatic build failure.