```json { "table_name": "search_engine_benchmark", "table_type_tags": [ {"tag": "dimension", "confidence": 0.90} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["id"], "unique_per_row": true }, "time_axis": null, "reasoning": "The entity id has Uniqueness 1.000 (each row unique), and engine (Uniqueness 1.000) identifies distinct search engines being benchmarked. The composite (probe_set_version, engine) also uniquely identifies each row. created_at is constant across all rows (Top 3 Coverage 100%, single value), making it a batch attribute rather than a time axis. Each row describes benchmark results for one engine configuration — precision, recall, timing metrics are attributes of that configuration. No action ordering or state transitions exist." } ```