Change Data Capture (CDC)

Change Data Capture streams row-level inserts, updates, and deletes out of a source database so downstream systems stay in near-real-time sync without full reloads. The strong form reads the database transaction log rather than polling tables, which captures deletes, preserves commit order, and adds almost no load to the source. The hard parts are ordering, tombstones for deletes, and applying the stream idempotently so a replay does not corrupt the target.