Design Review Checklist (DynamoDB)

• [ ] Access-pattern matrix documented (who/what/why/SLA).
• [ ] Single-table decision justified.
• [ ] PK/SK generic names (PK, SK) + decorated values.
• [ ] Hot paths are Get/Query (no Scan).
• [ ] Sort keys encode order/time where needed.
• [ ] High-cardinality PKs; write sharding for hotspots.