{"id":"dynamodb-putitem-replaces-entire-item","text":"PutItem replaces the entire item if the primary key already exists — it does not merge attributes; use UpdateItem for partial updates.","truth_value":"IN","source":"entries/2026/03/11/amazondynamodb-latest-developerguide-getting-started-step-2html.md","source_url":"","source_hash":"650604b8ee8752c4","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"dynamodb-putitem-replaces-entire-item","truth_value":"IN","reason":"premise"}]}}