Legacy systems in data centres struggle to handle today's mission-critical applications due to their inability to process real-time data at sub-millisecond speeds. This disadvantage can be mitigated through continuous application modernisation, which involves leveraging a NoSQL multi-model data platform that supports JSON document store for efficient handling of diverse and dynamic development patterns. By refactoring applications, optimally storing and querying data, and intelligent data processing at the edge, organisations can ensure their data centres use modern data pipelines to augment mainframes with an intraday operational data store. This approach significantly lowers the Total Cost of Ownership (TCO) while maintaining performance, reliability, and scale.