video1.0<iframe src="https://www.loom.com/embed/273e798f65534488b6b7314bc8cffd01" frameborder="0" width="1920" height="1440" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>14401920Loomhttps://www.loom.com14401920https://cdn.loom.com/sessions/thumbnails/273e798f65534488b6b7314bc8cffd01-4b99faf294b0c751.gif981.543In this Loom, we show how to migrate ACAS payment data from a 48 year old COBOL system into a modernized Python microservices app without downtime. We run legacy and modern side by side, using an ordered reliable message queue fed by a Change Data Capture adapter that reads legacy ISAM changes and replays them after a bulk ETL snapshot. The demo shows a live payment entered during migration being applied after the load completes. Data stays in sync in seconds, and cutover becomes a business decision. No action is requested from viewers.