```json { "table_name": "metrics", "primary_key": "metric_id", "candidates": [ { "rank": 0, "partition_key": "metric_id", "partition_key_label": "primary_identifier", "partition_key_reasoning": "metric_id is the unique identifier for this dimension table with RPUV=1.00 and uniqueness=1.000, representing each metric definition. With only 2 rows currently, partitioning is not strictly necessary, but metric_id serves as the natural primary identifier for this catalog table.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require clustering. The table is small (2 rows) and lookups will be by metric_id.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "This is a metric definition catalog/dimension table. The primary_key is metric_id (unique identifier). While declared_at exists as an event_time column, it represents when the metric was declared, not a state snapshot axis. For a 2-row dimension table, partitioning provides minimal benefit but metric_id is the semantic primary identifier." } ] } ```