{"id":"unbundled-db-cdc-events-carry-old-value","text":"Every update and delete CDC event includes the previous value (`old_value`), enabling derived systems to undo prior state; inserts have `old_value=None`.","truth_value":"IN","source":"entries/2026/05/29/unbundled-database-tester_test_unbundled_database.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"unbundled-db-cdc-events-carry-old-value","truth_value":"IN","reason":"premise"}]}}