Many data platforms consider audit-readiness a secondary issue addressed after development. They prioritize building pipelines and dashboards before considering regulatory requests. This often leads to reactive solutions like searching backups or reconstructing data from logs. Sometimes, the necessary historical data is simply missing. This approach describes a "compliance checkbox" architecture. The alternative, an audit-ready-by-design, treats three properties as fundamental constraints. These essential properties are data lineage, point-in-time reconstruction, and immutability. Implementing these as architectural constraints from the beginning is crucial. Unlike bolted-on scripts, architectural constraints cannot be easily ignored under pressure. This proactive design ensures true auditability.