```json { "classifications": [ { "column": "dataset_id", "role": "identifier", "confidence": 1.0, "reason": "Foreign key referencing datasets; used for joining tables, not aggregation" }, { "column": "batch_id", "role": "identifier", "confidence": 1.0, "reason": "Unique identifier for each batch run; 110 distinct values for 110 rows indicates primary key" }, { "column": "content_key", "role": "identifier", "confidence": 1.0, "reason": "Hash-based unique identifier; 110 distinct values for 110 rows, used for content identification" }, { "column": "method", "role": "dimension", "confidence": 1.0, "reason": "Categorical field indicating ranking method; only 1 distinct value ('llm') but designed for grouping/filtering" }, { "column": "ranking_json", "role": "attribute", "confidence": 1.0, "reason": "Long-form JSON text containing detailed ranking results; descriptive content for display, not for aggregation" }, { "column": "created_at", "role": "dimension", "confidence": 0.95, "reason": "Timestamp for temporal filtering and grouping; used to slice data by time periods" }, { "column": "updated_at", "role": "dimension", "confidence": 0.95, "reason": "Timestamp for temporal filtering and grouping; tracks modification time for analysis" } ] } ```