```json { "table_name": "titanic", "primary_key": "PassengerId", "candidates": [ { "rank": 0, "partition_key": "PassengerId", "partition_key_label": "primary_identifier", "partition_key_reasoning": "PassengerId is the unique identifier for each passenger. RPUV=1.00 (perfectly unique), Uniqueness=1.000, monotonicity=1.000 (strictly increasing). This is the natural primary key for a dimension table containing passenger attributes.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require clustering keys as they represent static entity attributes without temporal or sequential ordering.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "This is a classic dimension table containing passenger demographic and ticket information from the Titanic. PassengerId uniquely identifies each row. The table contains no temporal axis (the _ingestion_timestamp is a system metadata field, not a business time dimension). Survived is an outcome attribute, not a key. This table would typically be joined to by fact/event tables using PassengerId." } ] } ```