```json { "table_name": "data_dictionary", "table_type_tags": [ {"tag": "dimension", "confidence": 0.90} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["Table", "Field"], "unique_per_row": true }, "time_axis": null, "reasoning": "The composite entity (Table, Field) is unique per row — Field has Uniqueness 0.857 and the product of Table (4 unique) × Field (18 unique) = 72 plausibly covers 21 rows given overlap. Each row describes one field in one table (metadata catalog). The four provenance columns (_ingestion_timestamp, _batch_id, _source_file, _source_system) are synthetic load-time columns and carry no evidence. No time axis exists; the timestamps are provenance only. This is a reference catalog of field definitions: dimension." } ```